#Ahhgghhh, that bloody chainwheel.... Doh ....

... yes I know its there, my son's bike hanging from the garage ceiling, next to my race bike. So why, everytime i put my day to day bike up against the wall, underneath, do I forget it's there. Its sharp and it hurts. And everytime I say to myself "must change its gear to the big ring so at least the chain covers the teeth. And do I ?? ........