I was going through the barriers at my tube stop tonight, when the guy behind me did that oh so crafty thing of swooping a ticket in the direction of something intrinsic to the act of passing through the gates. I turned to give him my best stare. Then I caught his conversation with his mate:

'When did you get out?
'What?'
'When did you get out? Was it Pentonville?
'Nah, Belmarsh.'

I didn't intervene. Such is my neighbourhood.