What are some April Fools' Day pranks for kids in 6th grade that they wouldn't get in trouble for?

Go and change all of the clocks in the house 2 or 3 hours ahead or you could put a post-it note over the bottom of the computer mouse so it does not work. LOL this is mean tell somebody that you love them and then an hour later tell them April Fools!! Hope this helps also search pranks online at google.com.