Makeshift dog sled stunt gone awry for Michigan state , authorities say . Authorities : Man was driving downhill when homemade rocket exploded . He donned a helmet and took a sled to the top of a snowy embankment . Man had reputation for ' ` ` crazy things '' at his parties , authorities say .
Makeshift dog sled stunt gone awry for Michigan state , authorities say . Authorities : Man was driving downhill when homemade rocket exploded . Man had reputation for ' ` ` crazy things '' at his parties , authorities say .