What the hell is a serial killer?

I’m watching TV series “The Bridge“, and in the 5th episode of the 1st season there was this great scene where two Mexican thugs are discussing what’s a serial killer.  The TV series are not a comedy by any means, and the whole scene is done with a straight face, but I think it’s one of the funniest things I’ve seen recently.

[youtube=http://www.youtube.com/watch?v=eXFfUdB3D5o]