Did you know that it's actually a chain on a a chain-saw that does the cutting? Oh, you did. If I'd ever thought about how chain-saws work I'd have imagined it was the bladey-thing sort of zizzing. I didn't realise it was actually a chain.
'The clue is in the name,' Husband said. 'Like monkey wrench.'
(And, trust me, that was fascinating compared to Husband's usual chats about the weather. He is becoming - sorry, has been for a while - a weather nerd. Now he's retiring there'll be not stopping him.)