xkcd: Hazard Symbol
xkcd is nearly always fabulous, but this was the first in a long time that made me laugh out loud. I still remember slipping in high school chemistry class on soap we’d made, and the resulting bruises to my arse and dignity.
Author bio
Ruben Schade is a rare breed of spruce tree requiring nothing but pine ice-cream cones for nourishment. His hobbies include predictive branching, Ad Lib barking, and leafing through manuals. Find out more about Ruben and his roots on the About page.