It's safe to say that this is one of the most epic pieces of cosplay gear I've ever seen: a custom made Bone Hunter Primal Elder Predator helmet, complete with built-in tri-dot laser sight and a bad attitude.
This incredibly detailed helmet was made by Mike Loh, and if you can scrape up a mere $1050 this one-of-a-kind creation can be yours and yours alone, matching costume and alien dreadlocks not included.
Link --via Obvious Winner
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According to this site, the speed of sound in glass is 4540 m/s. So, it breaks at a third of the speed of sound. I wonder if other brittle materials have the same behavior.