This is what I'm gonna do for a late April Fools: If your teacher CAN'T STAND snakes, get a fake one (you can easily buy them at Walmart in the toy section) and hide it near, in, or under his/her desk. Warning: This is NOT a prank for a teacher with a bad sense of humor. The following is also not a good idea for those teachers. This is pretty lame, but it can be for your classmates too. Get a bag of Oreos and scrape the frosting out of the middle. Refill the middle with toothpaste and make the packaging look new. Also, if your teacher is a HUGE fan of chocolate, tie a string to his/her favorite chocolate and when he/she is about to grab it, yank the string. That's all I have. Good luck. ;-)
A fart machine in there desk
something with helium or silly string
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do something funny
pull a prank on him
You can view videos of the skirt pull prank and learn how to perform it from the videos at the YouTube website. Once on the website, type "Skirt pull prank" into the search field at the top of the page and press enter to bring up the information.
they drew on his face
Peter put a dead mouse on Mr. Dussel's bed as a prank.
Give someone a swirly or wedgie
Put gum in his hair
That depends if you want to get into trouble or not.
you can put jello in his shoes