At a con in Chicago, I saw a fan get yelled at for asking a simple question.
This was at C2E2, maybe three years back. A kid, maybe 14, asked an artist about a character's backstory. The artist snapped, said 'Read the book, it's all in there.' The kid looked crushed. Everyone around just shrugged. I don't care how busy you are, that's no way to treat a new fan. Since then, I make a point to be extra patient with new people at signings. Anyone else see stuff like that and just feel sick?