Programming problems that seem easy, but aren't, featuring Jon Skeet

Jon Skeet, for those not in the know, is legendary here at Stack Overflow. He even got his own Chuck Norris Facts-style jokes.  Jon has graced the podcast before in the early days on episodes 4, 72, and 123. He’s so good at answering Stack Overflow questions that he appeared at Stack Overflow’s old NYC office and answered them in person.  While he’s not the only million rep user, he was the first, so we ran the numbers on him.  Have a question? Jon Skeet has probably answered it on Stack Overflow. You can also find him on Blue Sky. Looking for C# 3.5? Spoiler alert: you won’t find it. Learn why from Jon’s very helpful question What are the correct version numbers for C#?