'Tis time to discuss the phenomenon known as The Ponytail Headache. What is this? I once asked my brother-in-law, who is a doctor, to explain.
I said, "Why is a ponytail so painful? Even when it's not very tight? And then why, when you finally release your hair from the elastic, is there a ghost pain that requires much vigorous and uncomfortable rubbing on the spot that was formerly ponytailed?"
It was a sincere quest for knowledge, but he only laughed and backed away slowly. I took a step forward in pursuit, but he held up both his hands, which I believe is the internationally-recognized sign for "Keep away, crazy girl."
This happens to me quite a bit.