[dceddia]

Yep, he said in a Reddit AMA that he never actually did this:

https://www.reddit.com/r/IAmA/comments/1ujvrg/jerry_seinfeld...

[TillE]

That's not what the comment says. He's pointing out that it's a simple idea which he did not originate.

[dceddia]

Yeah good point, upon rereading that comment he's just saying he didn't invent it, not that he's never used it. But he calls it "the dumbest non-idea", which would suggest he doesn't think very highly of it...