I wanted to do that so bad for my chemistry project. We were had to make a certain food, and explain the chemistry behind it. Then you had to bring it in and share it with the class and teacher. I was seriously thinking about putting some weed on top of the pizza, since it would just look like parseley or some other herb. I could imagine the class like laughing and shit at nothing. However I didn't do it because I was afraid someone who had done it before might notice, and be a nark about it.