Teacher: What's the difference between a parachute and a condom?
Xiao Qiang: One protects the top, the other protects the bottom.
Teacher: 60 points.
Xiao Cui: When a parachute breaks, there will be one less person; when a condom breaks, there will be one more person.
Teacher: 100 points! Alright, let's move on to today's picture gallery.