Glad wrap over the toilet seat.... A cable tie on the drive shaft of someones car (when it spins it makes the most annoying ticking noise)... The old fashioned super glue a dollar to the ground... take an empty beer and fill it with a soda water/plain water and a lil bit of pineapple juice (just enough to make it look real) add something to make it taste foul replace the lid and stick it up the back of the fridge... God that one was funny...