I would've wished I'd said,"I'm going to tell all my friends about it and laugh at you for years."
I had a blind date Freshmen year to an SYR that I walked in on kissing himself in the mirror in my room. I still have no idea what that was about -- Practicing? Narcisist? Perv? Just plain weird? I didn't stick around to find out and he was too drunk to notice.
(edit -- the guy wasn't actually physically blind, the date was. In case it's not clear.)