Do Not Free Willy

(I am driving home from the cinema with my 9-year-old son. I get cup up by another driver and in my frustration muttered ‘wanker’ under my breath.)

Son: “What’s a wanker, mum?”

Me: “Um, its a man who plays with his willy.”

Son: “Oh.” *looks contemplative* “But mum, how did you know he was playing with his willy?”