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Ichthyology!
An ichthyology student walks into a bar and orders a beer.
“How are the studies going?” the bartender asks.
“Really great. In fact, right now I’m working on my thesis to explain
why koi fish always swim in groups of four,” the student replies.
“Why do they do that?” the bartender asks.
“Well, in the wild, if a group of four koi are attacked by a predator,
the odds are good that let’s say the A koi, the B koi, and the C koi
will all escape to reproduce and live another day,” the student says.
“Because the predator will always go for the D koi.”
