What do you do when ..

[Carsman]

It's been years since I was on an elevator but would probably just smile and press my floor button, screw them.

OK, you've all convinced me, I won't say anything, since after a 30 second ride, I will never see them again, so screw them!

(That's of course unless the elevator is at work, (like I used to have) but you still don't know the person, however it's likely you may ride it again with them)