My initials..kinda.
One day in junior high school around 1998 a shitty kid who sat behind drawing tags and graffiti all day decided to tag one the papers on my desk when I got up to hand something to the teacher.
When I got back I saw "AxM" on my desk and was immidetly pissed. Then I looked at it further and thought it was cool so I told the kid thanks and ran with it ever since.