It makes him laugh. It was so stupid and trivial, but that little snapshot into normal, dumb teenager antics breaks through all the crap going through Tony's mind and he just laughs.

"He's such a wimp about needles!" He hears himself tell Pepper rather than feels himself doing it. His head feels a little too light. "D- do me a favor? Dose him up again."

And that's all he can say before he faints.