I hope they were practicing safe math.
Where's the punchline?
Lol, the first comment was the punchline! XD
Your mom's the punchline!
Your Mom Jokes - math style. :D
after taking the derivative of your mom i could lie tangent to her curves :D
Something I once wrote on the board in our Math PhD Office:
Yo momma so fat, the smooth n-manifold of her surface can't be smoothly embedded into R^2n!
Wth? The link got messed up... -_-