Unless you're joking I'm guessing it was just a glitch or you (or someone) had registered with the same name before and ignored him, but their account was since deleted.
hammonds is not currently being ignored by anyone.
I'm actually not joking, so I guess it must have been a glitch.
I had to figure out how to un-ignore him, although I wasn't sure if I should, if it was intended to be a feature.