I've done similar stuff like that over the years. Somewhere, where nobody will ever find it. I've always signed poop "Why Me?" (AKA....written on a wall, pipe or ductwork somewhere). The funny thing was years later, somewhere in the early 2000's. I ran into an maintenance engineer, who had happened to work in the first commercial office building (years later obviously) that I had started my career in, back in the mid 80's. He was telling me how he found that someone had written (all over the building in weird, hard to get to areas) the puzzling "Why Me?"
I was laughing as I was telling him that it was me that had written it.