Remember kids... always wear a helmet. (The almighty bikeradar helmet thread)

Are you saying that if you knew someone was about to hit you over the head with a sledgehammer at 25 mph you would not put on a bike helmet if offered one?

I be more concern to why someone is about to hit me with a sledgehammer and try to avoid it in the first place.

At 25mph, the helmet will very likely not to be effective, especially with a fucking sledgehammer.