Asthma attack!
Matthew sets up Andrew to go on a blind date with a friend of his. But Andrew is a little worried about going out with someone he has never seen before.

"What do I do if she's ugly?" says Andrew, "I'll be stuck with her all night."
"Don't worry." Matthew says. "Just go up to her door and meet her first. If you like what you see, then everything goes as planned. If you don't, just shout Aaauuuggghhh! and fake an asthma attack."
So that night, Andrew knocks at the girl's door, and when she comes out he is awe-struck at how beautiful and sexy she is. Andrew's about to speak when the girl suddenly shouts, "Aaauuuggghh!"