Math Jokes 4 Mathy Folks is a delightful read. The author has compiled a vast array of puns, quips, and jokes meant for people of varied ages and mathematical expertise.
I highly recommend this book as a diversion from the rigor of mathematics. It allows us to have a good laugh (or a long groan) at a joke that only “math nerds” would get, and it points out that humor can be found in all mathematical applications, even a telescoping series.
I love the cliffhanger at the end! The reference to a “telescoping series” is — I think — in regards to this joke (p. 89):
If you’re interested, here’s a copy of the entire review. (Click on the image to view a full-size version.)