"He said "signature" and then identified the person to whom he was speaking via the comma placement."
I don't know and don't care what your real name is, but if a bank teller said "sign the back of the check, Artist", good luck trying to cash or deposit by signing anything but the name beside "pay to the order of".
"Take a look at the Chicago manual of style"
Is that similar to Chicago's list of names of people who voted in every election after their death because someone forged their signature?
Maybe the precinct workers know their real names, but to make it look legit, they say "sign here, (comma) Mr. Dead Guy. And believe it or not the signature is Mr. Dead Guy. Do you always draw a dancing banana instead of signing with your signature on the back of any legal documents?
"Are you really serious?"
If you ever do win a jackpot, draw a dancing banana next to "signature" on the back of the ticket and tell us how you made out. Fatty must be getting disparate if he needs your nonsense. I already have one stalker so make any silly comments and play your childish games with someone else.