You know the thing:
A Pride of Lions
A Murder of Ravens
A Tower of Giraffes
A Mob of Kangaroos
etc etc.
New ideas?
I like:
"An exaggeration of Realtors"
"A Deceit of Politicians"
"A Butthurt of OOT'ers"
and of course,
"An CUnt of Assylumites"
Carry on