"Oh Shit" moments...

Not so much an OHSHIT! moment but an ohh, *shit *moment last night.
I was waiting at the lights at Clapham North on the way home and this big guy pulls up next to me on a hybrid, with nice wheels and stuff, which I start idly checking out (habit, I need to get out more). I notice something weird - his bars are cut down, but only the right one, and it's only about 4 inches long, with a** bell** and cyclecomputer on it. It may seem obvious to you why this was, and it did to me approximately three seconds after I opened my fat gob and said "dude, what happened to your handlebars?!". Staring straight ahead, he said "I've only got one", and thankfully before I said "yer but why" I realised that he in fact only had one arm, necessitating only one handlebar. His right arm was missing, a fact I did not ascertain at first because he was side on to me. I opened my mouth to jabber an apology but the only word "dude" fell shakily out again, as I turned to beetroot; the lights changed and he pumped off. I am very sorry Mr Man With One Arm. I'm a hopelessly inquisitive c*nt who opens his mouth when he really should be minding his own business.

So how was he planning on ringing the bell?