Back skull bone pops out whenever i get mad?

when ever i get mad/angry the back of my head(like the skull bone w.e in the back) seems to pop come out its not that noticable but when i feel it, its like a bone poping out from the back of my head, and it kinda hurts, but like 5 minutes later it goes back down..... is this normal if not what is it?Back skull bone pops out whenever i get mad?
quit getting mad.
BONES DO NOT INCREASE ION SIZE IT IS DUE 2 THE MUSCLES & VIENS THAT ARE RECIEVING MASSIVE ADRENALINE RUSH WHICH SHOULD ALSO CAUSE A SEVERE HEADACHE & TENSE SHOULDERS, & NECK IT IS SURVIVAL
The bones of the skull are not popping out anywhere. What you are feeling is an engorged vein or artery, being engorged and distended by the higher blood pressure caused by your anger. The elevated blood pressure and increased levels of adrenaline are what make your head hurt at the time and for a short time the anger passes. Not exactly abnormal, but obviously a clue that you should perhaps consider tempering your anger.