Let's Stand In The Road!

I regularly get idiot 16 year olds near liverpool street shouting and trying to jump in front of my bike - this is where I should shout I cant brake. Or going across london bridge a troupe of tourists crossing the 8 lanes of traffic then they see people on bikes and they stop walking so I aim to ride behind them, then they start running backwards to the central divide then I nearly hit them.

This has real Darwin potential.