After a scandal in our institution with medical professors publishing in pay-for-play journals, we were required to take an ethics class. Our PI scheduled this for 10 am, and not knowing better I booked an hour of time and brought a notebook.

The presentation was two slides. The title slide was presented, and then a content slide was presented. Professor's lecture on ethics was, in its entirety, "You guys know enough not to be unethical. Don't be unethical." We pretended to be learning from the second slide while someone took a picture to present to administrators, and the ethics class was dismissed. I had 55 minutes of my hour left.

Unethically completing an ethics class was one of the most ironic experiences I've ever had.