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xkcd #2929: Good and Bad Ideas
(imgs.xkcd.com)
Alt text:
While it seemed like a fun prank at the time, I realize my prank fire extinguishers full of leaded gasoline were a mistake.
It might just be a joke. I use transitions in my cycling glasses, where I might be in shade or when it starts to get dark (but I'll still have something protecting my eyes). I use regular sunglasses in the car, as transitions generally won't work there.
You can get them to work in the car. You just need to break all your windows.
Easy.
I prefer to cut the top off.