Related:

• One of the best ones I heard, was to do the following
  During winter time in any part of the country where it gets really cold, take your victims mattress, soak in water until it has reached it's saturation level, then hang it outside until it freezes solid....
• 1) Get a piece of plastic as long as the victims bed and a little over twice as wide.
  Remove his mattress from his bed frame and line the frame with the plastic....
• Everyone's heard about filling the victim's room with balloons, right?
  (balloons are great, especially if the victim is your SO and you come by later, acting innocently, and suggest....
• Next time when you are having dinner, keep an empty jug of water on the table.
  When somebody asks you to pass the jug, pretend while picking it up that it is full of water and heavy....
• Practical Joke at a party. Take a sheet of cardboard or a throw away magazine, form a cone with it.
  Take the cone, a coin, and a liquid refreshment (water causes least damage) in a bottle or a cup, of course you will be pretending its your drink....
• If you live in a dorm with tiles on the bathroom door, pour rubbing alcohol in the cracks, wait for your victim to go into the bathroom and seat himself, and light the alcohol.
  If you can get into your victim's house, staple the sides of many paper cups together so that they are in a ring or matrix configuration (anything too large to drag out the door), and fill them all with water....
• Top 30 Ways to Simulate Being in the Navy when You're at Home 1.
  Lock all friends and family outside. Your only means of communication should be with letters that your neighbours have held for at least three weeks, discarding two of five....
• Tell someone you can pin a glass of water to the wall -- a real glass, not a paper cup, using an ordinary straight pin.
  Naturally they won't believe, so you set out to prove it....
• Butcher Dance A guy has spent five years traveling all around the world making a documentary on Native dances.
  At the end of this time, he has every single native dance of every indigenous culture in the world on film....