...snip...Concussion is the word I'd use too...but maybe the word doesn't actually signify much in the way of detail or level of severity. And yeah, when you hit one side of the head there can be enough energy to bounce the brain off the other side of the skull. The initial blow is call the 'coup', and the bounce is the 'contracoup' The the cerebral spinal fluid and layers of the brain provide protection, but sometimes not enough.
...snip
See? Most of us just say "ouch".

(Thx for the info CES...just kidding. Have a good day.)
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inconvenient?????? i'd be climbing walls
I'm buying a another lemo drop.