This is why you should pay attention in math class and never stop watching what the teacher is doing even for a second.

Added: February 3, 2015

More Funny Videos

Fearless French Bulldog chases away two bears.

One offensive Halloween costume can ruin the whole party.

Elephant runs to protect its caretaker.

Cat thinks using the pet door is dumb.

Crazy real world demonstration of the Tesla Model S P90D autopilot system.

President Barack Obama crashes wedding at Torrey Pines golf course in San Diego, California.