Traffic-stopping bra and panties!
It's true. In Durham County, England (beautiful place, btw) someone flushed a bra and panties down the loo and it combined with french-fry grease and other non-flushables to clog the artery of the sewage system. In fact an entire 10 meters of road collapsed.
Also in England, a CCTV was set up to watch a particular spot to determine who was letting their dog crap there every day. Turns out it was a person. Ew.