Et tu, Brute?
When I was a kid I had a joke book which after a lot of head scratching the past couple of days, I've decided was written by Bennett Cerf.

It was the usual stupid jokes that kids think are funny except for this one that I never got that went something like:

What did Caesar say when Brutus asked him how many hot dogs he had at the forum?

Et tu.

Of course I didn't get it. It was explained to me and I still didn't get it. I remember reading this joke repeatedly, trying to figure it out. I can still see the line drawing with two guys in togas with leaf-crowns on their heads, holding hot dogs and one holding up two fingers.

It's a not even funny joke to begin with and then trying to pass it off in a children's book?