Altitude Change

Summer of '09, my sister and her then fiance came out to help us with yard/outside work in preparation for their wedding reception.
a bare wall on the outside of the back porch.
I was on a stepladder with a roller, and commented that if I bent down I got a headache, and if I stood up straight I got a headache. (I get headaches from bending over, I guess from the blood draining to my head. And the afternoon sun shone over the roof into my eyes when I stood up straight.)
My now brother-in-law's response:
"it's from the altitude change."
(I was 5'8" then, at age 14)

I was amused. Still am.