I was riding in the car with friends, one of which, at 22, was aggressively balding. He said something like "yeah, me and treeshrew will be bald in a year!" - i was like "speak for yourself"
when i got home i immediately pulled my hair back and realized, yes, that widow's peak i've always had was getting bigger.
then it hit me - my grandfather was bald. i checked out some pictures, and sure enough, he was slick bald at 30, something i had never noticed or had even crossed my mind before.
i thought to myself - well my hair is receding this sucks - then one day, a year or two after i had accepted this fate, i took a picture of the top of my head - and DAMN a huge bald spot i had NO idea about. that was truly shocking.