When you visit your friends house, put a squirt of washing up liquid in their dishwasher. Next time they run it suds will come oozing out the door.
Place a coin on the ground and wait for someone to bend down to pick it up. As they do, tear a piece of fabric and the'll think they just burst their pants.
Tie a thin, almost invisable piece of thread to a coin and place it on the ground. Wait for someone to bend down towards it and pull it away at the last second.
Wait 'till someone is drinking a can of fizzy soda and when their not looking drop in some sugar or a sugar sweet. The soda will fizz up and start pouring uncontrolably out of the can.
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