You have my sympathies!  I've done the "not 
ducking down enough" thing (when you get totally 
used to minivans and Jeeps, you've got to be 
REALLY careful getting into a low-slung sports-
car!), but luckily didn't get concussed.  Or 
maybe there's just not that much difference with 
my brain between regular and impaired states to 
tell...

Anyway, I don't have any swirly-eyes, but how 
about a bonk on the head to illustrate the impact 
area - and Inuyasha's expression, I think matches 
the ones we probably had when we realized what we 
just did -