The do's and don'ts of hanging your helmet on your handlebars

1. Don't do it when the steering isn't locked
2. Don't hang them right on the end of the bar
3. Don't strap a bag on the back of the bike with your helmet balanced on the handlebar and the steering not locked
4. Do check your bank balance
5. Do notice your helmet has fallen to the ground
6. Do find that it has a dirty great chip in it, rendering it structurally compromised
7. Do go out and buy a new one
8. Do kiss goodbye a grand on a spanking new helmet
9. Don't ever, ever do it again!