This article is from the The Complete Guide To Hack Stand-Up Comedy, by Steven Rosenthal and Steve Silberberg (firstname.lastname@example.org) with numerous contributions by others.
Hey, does anyone like gay porn? Oh, so it's just me.
Typical crutch guaranteed to get a laugh. Ask a rhetorical question to
which nobody in their right mind would admit to. Then follow it up with,
"It's just me". Oh I get it, the hack denigrated him/herself. Ha ha ha ha!
Hacks often use this line, but it's a truly accomplished hack who can use
it as a callback -- and believe me, there are plenty who do.