Colin Firth is getting Oscar buzz for his role in Tom Ford's first directorial effort The Single Man, but there's a TV actor who makes a voice cameo in the movie and he goes completely uncredited. He plays the guy who phones and delivers some bad news to Firth's character (obviously this might be a spoiler if you haven't seen the movie). Answer after the jump.

Yup, it's Mad Men's Jon Hamm

[via New York]