In high school we had a guy who would go around asking people "Have you ever been caught masturbating?" This was in Va., so 10 times out of 10 the person being asked would blush and say "ABSOLUTELY NOT!" to which the guy would respond "Sneaky Sneaky Sneaky, aren't ya?".
I tried this gag once in New York. The respondent said "Dude, I'm jerking off right now!!" Joys of North Vs South. Wonder how the joke would play in Texas.