Well, it wasn't a Thompson...
When I was 12 years old, my Mom and I found a sawed off single shot 12 gauge and a white canvas bank bag on the side of SR 180. The bag had the name of some bank from Kentucky IIRC. (there was no money in the bag) We took it to the Sheriff's dept. and Mom filed a report.
"9mm has a very long history of being a pointy little bullet moving quickly" --Sevens