My old dad has early on sets of Diabetes. Diabetes can suck a dick.
Not an unpopular opinion, mind.
How about: back in the day, German law for automobile signalling lights was pretty damn vicious. They specified the shape, height from the ground, colour etc down to the last detail.
I actually miss that. Nowadays every car has their own shaped turning/braking lights and it's been bothering the everloving fuck out of me. Some even do some KITT like faux motion stuff. Annoying as fuck.
Of course, it would be severely limiting to car designs. Most of modern cars look like crap, anyway, so I'm completely willing to accept that as a necessary sacrifice.
There, controversial, uncommon, probably unpopular. I R gud poster.