I made a few maths jokes based on the 3 trivial regular polytopes:

1) Q. Why did the cube drink a load of coffee?
    A.  Because it wanted to be a "hyper-cube"!

2) Q. Why did the "measure polytope" marry a "cross polytope"
    A. She was a jewel (dual) (this might not make sense to some people!)

3) person 1: what's the opposite of a simplex
    person 2: a complex
    person 2: no a simplex! It's self-dual

what do you think?