Link of day: groups

A group of birds is a flock of birds. A bunch of bison is a herd of bison.

What's a group of geometrists called? A plane of geometrists!

Wikipedia has a page on the collective nouns and I have spent way too long looking through it. 

Some of my favorites are:
- A chain of convicts
- An asylum of managers
- A shower of meteorologists

- A wave of surfers