C: "The tooth fairy didn't take my tooth last night."
H: "Awww...crap. Kiddo, I'm sorry... Here's $5. (x5 the going rate of $1, because guilt will do that.) So, you're a big boy now, and, well, honey, the tooth fairy isn't actually real. It's just parents, and we screwed up last night."
(Long pondering pause.)
C: "No, I think she got lost."
And now I feel even worse.