This is MIT student Tyler Christensen's Tesla coil hat, which โ€” in the name of sheer comedy โ€” he programmed to play the theme from Mortal Kombat (recently) and Harry Potter. Sadly, strapping a Tesla coil to one's head isn't always the best idea โ€” the hat blew up before he could show it off on Halloween.

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[TC-Engineering via Boing Boing]