In one of my courses we took Myers-Briggs, which the professor scored and then handed us a summary of our results and asked people how they felt the results act

In one of my courses we took Myers-Briggs, which the professor scored and then handed us a summary of our results and asked people how they felt the results actually matched up with them. Virtually everyone agreed that the results were fairly accurate, at which point our professor provided us with our real results and we went through the various possible results to understand how they're designed in such a way that you can generally find ways to agree with the results no matter what you got. Needless to say I've ignored any MBTI results since.