Er, um, we need a name that's witty at first, but that seems less funny each time you hear it.
Principal Skinner in Homer's Barbershop Quartet
I've just caught up on the first season of The Wire on DVD. It's great. I should write more about it at some point (as soon as I've done that Doctor Who first season review), but one thing about it annoyed me. The two fat lazy alcoholic cops were called Polk and Mahon. I don't think anyone actually says "You two! Polk, Mahon!" at any point, but you could feel the writers trying their best not to...
Luckily they got written out of the show fairly quickly.