We've all been in that situation on BART -- the train doesn't arrive for another 20 minutes and you've got to take a dump.
But what about those people who aren't waiting for a train and have no place to go to take that dump? Or the people who are too drunk and can't wait. Well, it seems they squat right down on the BART escalators and relieve themselves without getting caught. According to today's Chron, one too many people are peeing and pooping on the moving stairs, enough that it's causing mechanical breakdowns.
As the Chron notes
All those biological excretions can gum up the wheels and gears of BART's escalators, shutting them down for long periods of extended repairs, increasing station cleaning costs and creating an unpleasant aroma for morning commuters.
Apparently, the fecal matter has accumulated to disturbing levels, forcing BART to call in the county HazMat team.