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Can anyone tell me any funny easy pranks i could do on my cousin?

Ive been trying to find i great funny easy prank but i cant find one on the internet can anyone tell me a few?

Public Comments

1. put clingfilm over the toilet pan.
2. Well this is what I did on April fool's day If he or she asked for a drink give them something totally different like if he/she asked for coffee then give him/her coke or pepsi and to make it more real add food coloring