Who is the dumbest smart person you know or have known?

I worked with someone who claimed to be a Mensa (which is a high IQ society). I always doubted it because he was, well, kind of an idiot. We were both tech consultants at the same firm, assigned at the same company. One day, a project manager comes up to me and asked if I could talk to Mensa Guy (I was dotted line in charge of him and others) "whatever he think he should do, he should do the opposite". From then on Mensa Guy was known as "Wrong Way".

One day Wrong Way interrupts me, asks me a tech question, and I give him the [b]correct[/b] answer. Then Wrong Way proceeds to [i]debate[/i] my answer. I kind of lost my temper with him and told him to never interrupt me again with a question about something he apparently doesn't know anything about, if he's just going to debate the answer.

Wrong Way was eventually asked to leave the company, and eventually got laid off at the firm. So, years later, I find some things online he wrote about what to or not to do when looking for a job. He was doing work for some placement firm, as he was no good at what he did and didn't keep himself viable with new tech. I felt like writing a comment on the site "please do the opposite of whatever he suggests".