Here are two of my favorites, but it's all in the presentation. (Also, you have to read your audience as this first one can piss some people off, in the wrong company)

How many radical feminists does it take to change a lightbulb?
(interrupting response, in a pissed off voice) "That's not funny!"

And this one relies on wording as well,

"Do you know how many Viet Nam vets it takes to screw in a lightbulb?"
-no- (The wording, it depends on the response "no", and not "how many")
"THAT'S RIGHT! YOU DON'T KNOW! BECAUSE YOU WEREN'T THERE!"

That one depends on the shock and loud drill seargent voice, with the stress on "DON'T" and "YOU WEREN'T THERE"
Try it in a crowd when lightbulb jokes are going around and you'll win the lightbulb joke contest EVERY TIME!