When I was in high school, we had an Intro to Psychology course. I was (and still am) super into psychology, so I took the course. Part of the course was that, as a class, we had to choose a psychological experiment and complete it, with everybody turning in their own research papers and thoughts on the experiment.

We chose a fun one from the list of pre-approved experiments- training rats to play basketball. So our teacher goes out and buys two rats. The pet store she bought them from swore up and down they were both males.

Well, we found out our Ralph was a Ralphina when we came to school and found 10 baby rats in their cage. Woops.