Partners in Crime

I'm watching YouTube and a Louis Vuitton ad pops up with these two characters who remind me of nothing so much as these two thugs from the James Bond flick Diamonds are Forever

Mr. Wint & Mr. Kidd (played by Bruce Glover & Putter Smith)
Mr. Wint: “If at first you don’t succeed, Mr. Kidd ?”
Mr. Kidd: “Try, try again, Mr. Wint.”

Mr. Croup and Mr. Vandermaar were a similar pair from Neil Gaiman's Neverwhere. In the book, one was short and crafty, the other tall and not too bright. Both of them were dead (and smelled like it), but they still managed to be polite as they attempted to kill you in a painful and terrifying manner.

Mr. Croup: You can't make an omelet...

Mr. Vandemaar: ...without killing a few people.

Update:

Just remembered the Twins from The Matrix Reloaded
Twin #1: We are getting aggravated. 
Twin #2: Yes, we are. 
Not quite as polite as the others.