I had a bad experience with him too. I paid for an autograph at Dragon Con and he asked my name, repeated it, then spelled it wrong (1 extra letter.. and it's only four letters long).
I sheepishly told him it wasn't spelled right and he rolled his eyes, crumbled up the paper, threw it behind him and said "so much for that photo. You couldn't have told me that beforehand?" and scribbled a new autograph.
It's not much, but it bothers me.
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