I have written in the past how I sometimes play around with my signature on the electronic signature pads in various stores. See the full post here.
Yesterday I went to Lowes (which has become a daily trip with all the projects we are doing) to return some "L" brackets I bought. The guy behind the return counter took my receipt and processed my return. He handed me back my reciept and said "Thanks Bob."
I don't think he was trying to be funny. I think he thought that Bob was really my name.