DaveO: Here's an old version of the 8:37 one:

"I'm not an antisemite."
"Well, I am. All the troubles in this country come from the Jews -- and the bicycle riders."
"Why the bicycle riders?"

And as to the 11:40 one, cf.

Boy & girl are sitting on a fence watching a bull & a cow.
Boy (shyly): Gee, I wish I was a-doin' that.
Girl (shrugs): It's your cow.