That is very dangerous!! On tuesday evening there were 3 people at the bus stop before Clapham common station, one man and two kids, the kids were around 14-15 years old, the man got on the bus and the kids walked towards the back of my bus(I was the driver, I moved off quickly as Centrecom had made a warning call a few minutes ago about 2 kids playing on the road at that area. Then the day after(Wednesday) I saw one of the kids but this time with a different guy and they were in Balham, they attempted to do the same but I was quick again. To be honest I had no idea what they wanted to do until this afternoon. I went to the changing over point to start my duty as usual and found a police car just in front of my bus, my colleague was explaining/reporting to the police what had happened. It turns out the teenagers have been trying to hang on the back of buses which pass by that area. I think they are not aware of the risk they take when doing that. Thank you very much for your correction. Cheers