I just found this short note I wrote way back in 2007 sitting somewhere on my computer:
I heard the funniest thing on a train today.
There were two girls, about 17, dressed up, fake tans and heels.
There was a group of four ticket inspectors standing a couple of meters away.
The girls started talking about what a group of ticket inspectors would be called.
The girls got off, and just after that the ticket inspectors went into the other carriage.
But before they had gone, one of them asked “what is the collective noun for us anyways?”
And one of them replied “I don’t know… assholes?”