I've always thought it quite interesting that some people are called Johnston, while some are called Johnson and others Johnstone. I also walk round thinking "Jackson", and feel I'm probably affected by names commencing with "J". I wrote a poem about it once:
Jim, Jim, Jim, Jim, Jim, Jim, and Jamie,
Were all most erstwhile friends of mine
Whose names were all the samey.
But Jack, Jo, Jeff, Jules, Jenny, Jill and Jed
Had differing names - although they shared
The letter with which they led.
I'm also quite fascinated by fish that don't have an "s' on the end when spoken of in the plural.Some do, but they're vastly in the minority. We discussed this once before, and I think Roger did a Beau Peep strip about it even. I remember he named a trout, Nigel. I have the original artwork from one of those strips.
Collective terms for animals and birds is great too. A murder of crows is a killer.
I like real ale too, but haven't had any for a while.