Dancing, sex and evolution
Now here's a study we should replicate as an in-class demo! This study shows that people who are thought to dance better are more "evolutionary fit." As in more attractive. Ok, how was it actually operationally measured? By symmetry.
So, how about a dance competition on the first day and an evaluation of how many hook ups were made on the last day of class. If that doesn't get us in to the DP, nothing will!