[Bill blinks, looking a little surprised at just who it is he ran into here but that grin of his doesn't falter for a second. Instead, he leans on his cane, tapping his chin in consideration.]

Boy, that's a doozy. Hmm... I think I'm gonna need a minute to think it over-- oh. Oooohh, waaaiit a second.

[He laughs and points at Stan, his expression seeming to say "oh you."]

I see what you did there.