Jerry Seinfeld On 30 Rock (2007)
In the premiere episode of 30 Rock's second season, Jack (Alec Baldwin) has the seemingly brilliant idea of digitally inserting a clip of Jerry Seinfeld, adapted from old Seinfeld episodes, into new episodes of NBC shows for a week. The promotion is to be called SeinfeldVision, and since NBC already owns the clips, there is no need to spend any money on rights or even paying Jerry (who's out of the country, anyway, and thus wouldn't even know).
Of course, Jerry finds out and treks into 30 Rock to confront Jack. While there, he meets Liz (Tina Fey) and gives her advice about her recent break-up with ex-boyfriend Floyd (Jason Sudeikis). This proceeds to happen. Despite his bone to pick with Jack, Jerry is made out to be a pretty pleasant dude.
Verdict: We imagine that a super paid comedian with a serious kicks collection would be pretty chill unless you were fucking with his money, so yeah, not much of a stretch for Jer.