An ‘exuberance of students’

What’s your favourite collective noun?

Collective nouns such as a murder of crows and a murmuration of starlings really amuse me.

Just wondered if there are  collective nouns for a group of  nurses, a group of doctors, a group of artists…. a group of policemen.
What would you call a  group of snails or a collection of ants?

Maybe you can help? Let’s make some up!

Or maybe you have a favourite?