John Posey he was not in the movie 3 Men and a Baby.

I found his IMDB page and I don't see "Three Men and a Baby" on his list of credits, but I didn't know he had been in an episode of Seinfeld! I didn't even know who he was until I watched that unaired pilot of "Full House" that he did. Seems he went on to be successful anyway.
Sad to say, but he seems to have more going for him now than Bob Sagat does. It's terrible that Bob thinks that going into stand up to say vulgar filthy things and try to distance himself from the Danny Tanner image is respectable. Not to me it isn't. It's one thing to want to be recognized for something other than a role that you played for seven years, but quite another to go to drastic measures. Just terrible.

http://www.imdb.com/name/nm0692663/

thanks for the info