I was watching S107 ("Aamco") of "Curb your enthusiasm" the other day and noticed that the guy playing Treeger (the super in the friend's building) was in that episode... during a dinner, after proposing a toast "to friends", the Treeger guys mutters "Friends... now THAT was a great show" and asks Larry David (the creator of "Seinfeld" and the main character in "Curb...") if he was involved with that show, too.
I thought that was pretty funny, in a way.
Aww well, maybe you had to be there... :-)