Throwing out a dropped helmet...Urban Legend?

[maillotpois]

Motorcycling gals - could it be that this comes from motorcycling?

Possibly. I have definitely heard of this, in regards to motorcycle helmets. However, I must admit to dropping my motorcycle helmet more than a few times and not replacing it.

I head in my MSF course, though, that for a dropped helmet to be damaged to the point of replacement, it had to have something inside it (i.e., your head). It's not the impact with the ground that necessarily causes damage, but the secondary impact of the skull inside the helmet. So at least my MSF course was NOT preaching "drop it get a new one".