forgetful? or need a doctor?

[RhndLev@cs.com]

Has anyone else ever come with a big bash in their helmet and no idea how it 
got there?  Man, my helmet has a major puncture and chunk missing and I 
cannot for the life of me remember how it happened.  I rode to a friends and 
was chatting and took the helmet off because I had a headache and I thought 
my helmet was too tight (it's a Lidlocker).  My friend and I noticed the bash 
in the side of my helmet when I took it off.  I'm almost certain I would have 
noticed that big piece missing if it was like that when I put it on.  Now, my 
neck is really sore and I still have a headache, but I swear I don't remember 
hitting anything with my head.  My pupils looks okay and I feel fine 
otherwise.  Am I a total freak or does this happen to other people?

Rhonda