I came close to having my baptism nullified by clerical error. When I moved congregations, the elderly secretary called me and went over my card details. At some point he said, "so you've been an unbaptized publisher since..", and I stopped him and said, "No, no I'm baptized! I was baptized on X date at this location". So he fixed it on the card before sending it off to the new congregation. I think back about that day and think, man I should have said, "yep, I'm not baptized! Send the card away!".
I wonder if the edits he made are in pen or pencil. Does anyone know if I can ask to see what my card says? Maybe I can claim he made the error.