A ___ of Zombies

There's been an ongoing discussion as to what a group of zombies is called. The following sentence mysteriously appeared on a whiteboard: "A Flock of Birds, A ___ of Zombies?" Here's a little taste of what appeared below over the next week:

Horde
Gaggle
Shamble
Murder
Mob
Aargh
Fiesta
Boy Band
House of Representatives
Vin Diesel
Bridal Suite

...and the list gets more ridiculous. Click the picture to zoom in on the full brainstorm... no pun intended.