This instructable will show you how to do a really effective (and messy) prank that is really, really funny to do.
Plus, I will take credit for this since this is in a book I got from the book fair in my school a few months ago.

Step 1: Things You'll Need

Things you'll need:
Flour (any kind)
Your hand

Plus, if you don't have flour, you can also use baby powder, but flour works better.

Step 2: Flour Power

Pour a little bit of flour in your hand.

Step 3: Cough It Out

Start a conversation with someone and in the middle of it, cup your hand with the flour in it (make sure the victim doesn't see it!) and put your hand to your mouth and cough really hard. Also, favorite this instructable and also leave nice comments! I LOVE NICE COMMENTS!