I got a Rachel from Cardholder Services call once during an in-office meeting so I put the call on speaker for everyone to enjoy, then immediately went to Graha

I got a Rachel from Cardholder Services call once during an in-office meeting so I put the call on speaker for everyone to enjoy, then immediately went to Graham King: https://www.darkcoding.net/credit-card-numbers/ https://www.darkcoding.net/credit-card-numbers/ to get some credit-card numbers that would pass their basic Mod 10 check and go to their CC merchant service, thus costing them money. By the sixth failed card and 20 minutes later the 'agent' figured out I was messing with him and threatened to rape my wife and kill me while screaming obscenities. It went very NSFW in a matter of seconds.