[panglott]

What on earth does some jerk goofing off on a skateboard have to do with normal travel at low speeds on flat roads in good weather by a competent cyclist?

If you're doing tricks on gravel, or travelling on mud or snow, or goring really fast, you may fall, sure, wear a helmet.

[dawkins]

It shows the benefits of wearing it. The guy in the video walks away totally unharmed. This kind of blow to the head can happen easily while riding a bike, specially in a city.

[wumbernang]

I've been cycling for 22 years. I've smashed my head on the ground 5 times now.

NEVER was it my fault. Just because you're not a dick doesn't mean someone else isn't.

[danbee]

I've been cycling on roads for 25 years and have never hit my head on the ground.