Difference of Opinion

A conversation with DramaBoy about why he is grouchy:

Me: Did you take a nap today?
DramaBoy: Yes!
Me: Was it a good nap or a really short one?
DB: It was a short one.
Me: So not a very good one, huh?
DB: Yes! (Insistently)
Me: You mean it WAS a good nap?
DB: Yeah.
Me: I see.
DB: It was a short one, toooo!
Me: I think they might be mutually exclusive, buddy.
DB: Oh.