There are quite a few pranks that cause humiliation, pain, or some sort of mess. Those are fine, but my favorite pranks are ones that cause several perfect seconds of utter horror.
This is one such prank.
All you need is some dry pasta and a permissive conscience.
**If you enjoy this prank, please vote for it in the April Fool's contest!**
Step 1: Set-up
Put two or three pieces of dry macaroni in your mouth and "cheek" them. That is, move them in between your teeth and your cheeks so that you can open your mouth and talk without them falling out or being seen. You can also stash them under tongue if your prefer. You might need to practice just a little if you've never hidden anything in your mouth before.
That's all! You're ready to go.