1.57. A man opens his mouth and dies shortly
afterwards.

1.57 answer: He annoyed the mafia several hours ago; he’s now underwater
and wearing cement Reeboks. (“Style is everything, and cement Reeboks sure
are stylish.”) (RA)

1.57 variant answer: The man is a vampire, about to bite a girl. Her
boyfriend arrives, realizes what is happening, and kills the vampire by
driving a wooden stick through his heart. (This was the original answer, by
Kari Hautamaki. But this answer would move the question to section 2, and I
like Russell’s answer better anyway.)

1.57 variant answer: The man opens his mouth; some killer bees (which
tend to prefer attacking darker areas) fly inside and sting him; the
swelling of his throat asphyxiates him. (MI)