Pun-ishment

Professor Punsley has been known to unleash a plethora of puns upon his unsuspecting students. Today, it's your turn!

Why was the math book sad? Because it had too many problems.

What do you call a group of cows taking a selfie? A moo-sel!

Pun-ishment is a powerful tool for brainwashing your enemies.

But be warned: too many puns can lead to punderminations of the mind!