Keep A Close Crotch On This Student

(I’m in an environmental science class for my science general education in college. The professor is explaining the difference between a jetty, usually used to stabilize an opening for an inlet, and a groin, used to prevent erosion.)

Professor: “So, let’s say [Student #1] built a groin where it would bulk up his section of shoreline. Then [Student #2] next door decided to build a groin for his section of beach, so all the sand moving with the current collects in front of his house instead of his neighbor’s. [Student #1], what would you do?”

Student #1: “I’d destroy his groin!”