How to make a funy surprise on 1 April for boring

SURPRISE
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It is possible to prepare a banal trick, for example to pour in salt tea, in a tube from paste to pour medical or something else. But it is also possible to prepare serious tricks, for example over a door to suspend a bucket with some liquid and to carry out a thread what at an entrance of the person it would touch a thread and on him the bucket with paint has poured out. There is an option shampoo to replace with color paint, will be ridiculous, but a little problemno. Somehow so.

There is something white on the sofa, and then sprinkle with flour. after someone gets up Tell him that his back is white, he certainly does not believe he will be funny to you