1. Spotting a cake tin on a colleague's desk.
2. The simple amusement of changing the sounds on a colleague's computer and waiting for them to minimise a window, start a programme, receive mail etc etc.
3. At 11.30pm I crawl out of the book I've been proofreading -- eyes bleary, hands aching, text dancing before my eyes. I realise I never hung my washing out. I drag myself to the kitchen... only to find that the washing machine fairy has got there first.