I was singing 'Sgt. Pepper's Lonely Hearts Club Band' back in gr.9, accidentally saying 'Sgt. Pappy's lonely etc...'. My geography classmate heard me say 'Sgt. Pappy's' and duly corrected me while at the same time, making fun of me up until and including now.
When we got Aces High and we couldnt make up names, he got a bright idea to call me Sgt. pappy.