I have been involved (at least in the congestion) in two fatalities caused by young women jumping down onto the track to retrieve their mobile phones. Apparently the last words of one, when her friends shouted a warning, was "Don't worry, they'll stop when they see me".
As well as being unbelievably stupid and dangerous, nobody has pointed out it is illegal, with a £1000 fine.
If anybody on this site thinks that all the arguments are unreasonable, the only advice I can give them is travel by bus. I think I'm talking for all the railstaff on the site when I say my colleagues and I don't want you anywhere near our workplace with that attitude.