Why do they do that?

Ok.

Jax has given me an idea.

What things do people do which makes you wonder why they do it?

For example, what is it that makes blokes collect, say 5 cent coins.

I understand the shrapnel collection found near where a bloke takes off his trewes, but why do some fixate on collecting certain denominations, and some only take that stash to the bank when they can barely carry the money box*?

*Unless, of course, the missus raids the stash for the occasional essentials.

Why do some people sneeze, and sneeze, and sneeze but will not blow their nose when you just KNOW that's what's irritating their nose and making them sneeze?

Update:
My Dad used to sneeze and sneeze and sneeze... and you just KNEW he needed to blow his nose, and they weren't delicate little sneezes, they were powerful ones that'd lift the ruddy roof off, and clean out your eardrums. Deafening.
Hmm. Maybe it's a Dad thing?

Thanks Jax!