The Edmonton Eulers
I was quite surprised the other day when I read this Division by Zero post:
A few years ago I found an alteration of the logo of the Edmonton Oilers (a Canadian hockey team in the NHL) in which “Oilers” was replaced with “Eulers.” I printed it and hung it outside my office door. Now I can’t find the original.
As it happens, I did a webcomic a few years ago called "Isotopes of Bismuth" and actually used this joke for the comic on October 2, 2007. Interestingly, it's not the same image (my version had serifs on the "U"), so Dave Richeson's original source must have been someone else with the same idea at the same time.