Following on from Artandco's thread; www.mumsnet.com/Talk/am_i_being_unreasonable/2765114-To-think-some-people-deserve-a-place-in-hell?msgid=64487353#64487353 which contains the story of someone releasing a load of hamsters on the tube for "exercise" 
I thought it would be fun/interesting to have a "things experienced on the tube/public transport" thread. So here goes;
Mine; Someone very publicly snorting cocaine at around 11pm on the Piccadilly Line. Another one was the man sitting in front of me masturbating behind his briefcase (retch). Also had an Italian tourist stroke my knee when I was a teenager (yuck).
What have you seen/experienced on the Tube?