If your talking about irl, if someone is sleeping (For some reason) put cold water into a cup or a bowl, put their hand in the water while they are sleeping and wait until they wake up
Or you could put whipped cream or shaving foam onto someones hand while they are sleeping then itch there nose with a feather when they wake up they go to itch there nose and put the whipped cream in there face lol! Its an old prank but still very funny
Print out a scary image ( like a face or something ) and tape it to the bottom of the toilet lid. Put the lid down and just wait, I did it on my mother last year and it was priceless, trust me
Buy a Coke and Sprite bottle. Then drink the Coke and transfer the Sprite drink to the Coke bottle. Then put oyster sauce on the Sprite drink then mix it well. Lel