I like my eyebrows. When I was a teenager, and strictly speaking I should have been outside while the floor varnish was drying, I taught myself to raise either one independently, rather the single one I already knew how to do. I had been told to pick a place, inside or outside, just stop migrating around the still-tacky varnish, so I settled on the couch with a mirror and attempted to locate and then flip the little signal that meant I was twitching that head-muscle. And, after catching the first twitch, I managed to amplify it...

It's about 20 years later, and I don't recall which was the original eyebrow. I think the right one. I remember that I couldn't get the other one to pull quite straight up, so it goes a little more sideways than the other, and the left one is more sideways. I thought it was a Vulcan superpower or you had to be born with it, until one of my friends told me it was possible.