Had a player who joined at the start of the second book of an Iron Gods campaign I was running. Tried to make a character that was way outside the creation rules I had given, which he tried to hide by not giving me a copy of his character sheet until the day of the first session he was in, and then when I called him on it, he tried to argue that it was all within the boundaries given. It wasn't. The character would have had to have had something like a 50 point buy when I had everyone use 20, and started with something like 25000 gp worth of gear, when he should have had closer to 6000, which was what everyone else had, plus he had made it chaotic evil with no backstory provided, despite me telling everyone that I wanted no evil characters without a decent backstory reason for it. When I told him that he had to fix it or I would give him a premade character I had until he could fix it, he spent a good 45 minutes arguing that I should let him play with his horrendously broken character because...well, he never actually gave a good reason. Eventually everyone else got him to play the premade, which he then tried to say had abilities that it didn't have during play. He also entered the game by stealing something from the party and then arguing that they should let him come with them because he had stolen that item. He also argued with every single ruling I made and made numerous sexual comments about two of the female players even after they told him to stop, and I told him to stop or he would be forced to leave. We ended up escorting him from the table and told him he was not allowed to play at our table again. And he still emailed me multiple times asking when the next session was.