I was on a sport route at 38, and I'm about 30' up, I look down to see my "belayer" lightin' up a cigarette! While I could care less if people smoke, I was about 10' above my last (i'm shamed to say...) bolt, so depending on his reaction time I could have made myself a little gaper-crater.
that sucked, I've never climbed with him since...
p.s. what kind of beer should I have for lunch...