Ill-logic

Overheard in the Mustard house last night, as if we don’t already have enough issues with dental care around here:

Me: Where’s my toothbrush?
Tony: It’s under the sink. Sacha used it to scrub the toilet. He also used it to wipe the snot from under his nose.
Me: Gross. Well, I guess I’ll have to get a new one tomorrow.
Tony: Why? It’s still good.
Me: You use it then!
Tony: No – you used it.