Answer: "Are you taking any prescription medication?"
Raymond asks this question to Susanna earier in the movie. Vern tells her that's what he says to any woman he likes. Later in Las Vegas, he meets another woman he likes. She likes him too and schedules a date with him, but when he asks this question, she cancels the date without making it clear to him. Raymond, believing the date would still go on, asks Charlie how to dance. Charlie teaches him. On his way to the date, he meets Susanna. Susanna accompanies Raymond to where the date was supposed to take place. When the woman does not show up to the date, Susanna gives Raymond a pity kiss, which he describes as "wet". Raymond reveals that this kiss happened near the end of the movie, when he tells the doctors what he and Charlie had been doing the last few days. Charlie's not to happy to learn of the kiss.