from this site https://www.beachnet.com/~jeanettem/jokes.html
APRIL FOOLS' TRICK: Pick a victim. Keep warning your victim that April Fools' Day is coming. Talk about a few great practical jokes, starring yourself as the joker. Develop an evil chuckle, if possible. When April Fools' Day comes, smile secretively every time you see your victim. You won't need to do anything else - your victim's nerves will already be totally shot. Heh, heh, heh.
BEDSHEET TRICK: Reach down and loosen the foot end of the top sheet, and then double it up underneath to tuck it under the top of the mattress. Nothing appears changed, but the occupant ends up trying to fit him/herself into a nice tight *U* made by the top sheet.
BLOODY FINGER TRICK: Get a small paper or styrofoam cup with a cover and poke a hole in the bottom with one of your fingers. Stick one of your fingers through the hole and make it look as though it is sitting on the bottom of the cup. Pour some ketchup on the finger. Open it up and show it to a stinky girl who has cooties. [Thanks to Joe Guy.]
BUTTER AND SALT TRICK: In the cafeteria, ask someone, "Did you know there is a chemical reaction between butter and salt that makes it get really hot?" Take a butter pat to demonstrate, hold your hand over and say, here, feel this heat... when the mark holds his hand over the butter pat you whack down on it so he gets butter all over his hand.
COKE AND M&Ms TRICK: Have a friend distract someone who has just opened a bottle of coke (I imagine it might work with other pop as well, but am not sure) While the "mark" is not looking, drop a couple of M&M's into the open bottle. Let the person get back to their drink. In short order, the cola will start to foam...and foam and foam and foam.
PINKY FINGER TRICK: Tell your friend to bite his pinky finger nail as hard as he comfortably can for 30 seconds. Immediately have him hook his pinkies together and pull. Eeoow!
SALT AND PEPPER TRICK: Unscrew the lids of the salt and pepper shakers, and fill the lids with salt and pepper, respectively. Then, tear or cut circles out of paper napkins to fit exactly over the lids. Holding the paper in place, carefully invert each lid and screw it onto the wrong shaker. The victim will see salt in the bottom of the shaker, but only pepper will come out, and vice versa.
SHAVING CREAM EXPLOSION TRICK: Fill a manila envelope with shaving cream. Slide the open, top end of the envelope under the closed bedroom door of a friend, roommate, brother, sister... Stomp on the body of the envelope as hard as you can. The shaving cream bomb will coat everything in the room. Works best on smaller rooms, like college dorm rooms.
SNEEZE TRICK: Get a spray bottle or squirt gun and fill it with water. As someone turns away from you, go up behind them and fake a big nasty sneeze and spray/squirt the back of their neck or hand (whichever level you're at).
SNOT TRICK: Take a little sauerkraut and stuff the end of it up your nose so it hangs down over your mouth. Put your hands over your nose and mouth and fake a sneeze in front of someone. Then pull your hands down and if you can stand it, start eating the saurkraut.
SOAP TRICK: Paint all the bars of soap in a house/residence/whatever with colorless nail polish (reserving, of course, one for oneself) then replacing them in the soapdishes. Those suckers won't suds to save themselves.
STORM TRICK: Requires three instigators. In a large bathroom with stalls or a locker room, wait for a victim to enter the stall and close the door. #1 instigator begins flashing the lights and yelling, "Lightning!" #2 then pounds on the door of the stall yelling, "Thunder!" #3 tosses a pail-full of water over the stall onto the victim yelling, "Rain!" Then all run like heck.
THUMBS TRICK: You will need a clear glass, 3/4-full of water, and a pencil.
Somehow steer the conversation to personal traits. Mention that most palm readers can tell if a person is left or right-handed just by looking, because the thumbnail on the predominant hand is larger. Most people will hold their two thumbs side-by-side and compare them. Nine time out of ten, the person will agree with you.
Next, mention that if you look at the two thumbnails while underwater, it will appear to be just the opposite, due to the optical illusion properties of water refraction. Should they hesitate to believe this, pick up the pencil and put it in the glass of water. Point out how it appears that the pencil is broken, due to the refraction principle.
Take out the pencil and say, "See for yourself." At this point just about anyone ever born will put their two thumbs together on the tabletop. Carefully (but quickly!) balance the glass of water on top of your victim's thumbs. When they lean over to look down through the glass of water, remove your hand from the glass and walk away.....
THREE TOILET TRICKS: 1) Smear Vaseline on a toilet seat when no one is looking. It doesn't take much. Adding a thin layer of sand to it is even better. 2) Put a tight sheet of Glad Wrap over the bowl under the seat. This works best in women's facilities where the seat usually stays in place, but in the dark (THE DARK!!!) no one can tell. [Thanks to Nemo.] 3) Lift the toilet seat and stir in several boxes of your favorite jello...yellow/lemon is particularly appropriate but any kind you choose will be just as annoying as another! Do this after the victim goes to bed and let the jello set overnight. The next morning it will be a solid block!
WHISPER TRICK: Meet someone you know in the school hall, talk with them, then say goodbye and let them walk away from you. When this person is a good distance from you, call them back (as if you have a secret to tell them, so they have to get close to you again). When this person gets back to you, lean over and whisper in their ear, "How far would you have gotten if I hadn't called you back?!?!"