I don't think I've ever mentioned this here...
When our son was four or five, he slept-walked. Right down the stairs and pee'd on our couch. Thank Goodness it was a used couch from several years prior and didn't cost us anything.
Anyway, the next evening at dinner we were laughing about it and he got all upset and said it wasn't him. I said something like "yes it was, we saw your little wee-wee."
And then he stood up on the chair and proclaimed "I do NOT have a little wee wee!"
I will never forget that. We tease him about it every year or so. And the couch? After we had it cleaned we moved it downstairs to his playroom and he used up until we tore it up for packing material for the move last year.