My older sister remembers playing mercury in high school.
I've never seen a sissy bar on a 500x. There is a first time for everything though. Dont crash on the way home. I can only imagine the environmental cleanup fee if you scatter mercury over a few thousand sq ft.
An old university professor had gallons of mercury in his shed. I tried to get some from him but was unsuccessful. All I have is the few oz in the carb board.