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The propellers can absolutely break skin.

A commercial quadcopter motor typically runs at 1000KV, meaning that it spins at 1000 RPM per Volt. Most batteries are 12-14 volts.

Even for little plastic bits, if they're spinning at 12,000RPM, theres a lot of kinetic energy behind them.

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There was, ironically, a MythBusters episode[0] on last night in which they were flying quadcopter drones into dummy torsos (complete with major neck arteries) to see what happened.

I'll admit I was surprised to see that, indeed, they were able to puncture through that poor soul's ballistic gel neck and sever the "aorta."

0: http://www.discovery.com/tv-shows/mythbusters/videos/drone-d...

Yes, with carbon fiber blades and a custom octocopter designed to carry 20lb payloads. Neither of which applies to the commonly available multirotors on the market.

Yep, the non-carbon fiber one just bent in the episode.

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