If you don't usually get headaches, I'd guess it's because your hair is drying with the elasticized hairtoy in place. When your hair dries, it shrinks as it's losing water to evaporation. Which could mean that as it dries, the elastic pulls tighter on your scalp. Maybe take it down and redo it a little bit looser, especially if your hair is still drying.
Of course if it's your coworkers, can't help you there... except to say, "Stay AWAY from the letter opener!"
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