Ah, yes, that is it. So he gets a few more seconds in the movie than I thought :)

[An army man is handing out welders glass to the observers. Feynman is in a car, Teller is next to him in a deckchair rubbing sun cream into his skin]

TELLER [to the army man while rubbing his hands]: On the leg, please

ARMY MAN: Feynman

FEYNMAN: No. The glass [knocks on car windshield] stops the UV

TELLER: And what stops the glass?