Check it out http://www.youtube.com/watch?v=wXyJgVlHUCw
That's why you do the math BEFORE scaling up the violent reaction

 

You should have seen my high school chem lab ceiling. messsyyyy!

 

I remember when I was in high school. We were proving the results were methane by lighting it in test tube. I don't know what these girls did, but it turned into soot instead of burning cleanly. You have to understand these were some very girly girls, perfect makeup, nice dresses, the works. Now they were covered in these little black flecks that if you rubbed them smeared all over creation (and makeup). Twas a good yuck at the time.

 

OOOOOHHHHHH yea, I know the type.
We have a blonde that screams every time something goes boom (which is a lot), always good for a laugh.
Couple days ago she got her hands covered in slime, and they turned green, bout the funniest thing ever