As a young man I helped my buddy’s family fix a leaky faucet. I had to turn off the water to the house and in doing so I flooded the basement. 50 years later they still call me “Jeff the Plumber”.
At my Jesuit university, there was a guy with a pretty common name, but he had an unfortunate birthmark on his forehead, and was forever known as Ash Wednesday
A Sound Strategy given my posting history! 
But really, an anonymous message board is the best place to tell the truth.
Yeah, thanks for that. Ick.
A guy I work with is Pickles. Well he really likes pickles.
I had a coworker who rolled over one of those early SUVs that was susceptible to rolling over. In the office parking lot. He was not hurt, but the car was totaled.
For a few years he was called Flipper. It slowly wore off because of employee turnover. Fewer and fewer people knew about the incident.