if you've ever made the mistake of taking the elevator on the Clark/Lake Blue line platform..
http://www.wsbtv.com/news/news/marta-in ... tor/ncPgH/ 
once when there were a lot of folks jamming up the stairs and escalator I happened to be near the elevator as this chick was getting in with
her kid-stroller equipped kid. thinking I was being smart and taking a short cut out, i jumped in the elevator and was immediately punched in the old olfactories by a HULK-SMASH strong scent of piss. I'd rather go through CS training courtesy of Uncle Sam again,
http://youtu.be/gcGKPH5MSuU , than suffer another urine-soaked CTA elevator ride.