Good Insincerity, but You Blew Your Line

Big black man is minding own business when two-year-old child sitting behind him slaps him in the back of the head.

Big black guy turning around, startled: What the fuck?!
Child's mother: What did I tell you about hitting people?! [Child shrugs his shoulders and looks confused.] I told you we don't hit people. That's not nice. Now, what do you say?
Child: Thaaank yooouuu. [Big black guy's eyes go very wide and he turns back around slowly.]

--N train

Overheard by: Trying not to laugh because that guy was pissed!