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Insanely Tight Japanese Parking Arrangements
(www.core77.com)
For stuff that's neat. Neat article? Neat video? Neat pic of a bug you saw? All good. Neat meme? Ehhh... take it to the meme subs.
Rules
I've never had one in any of my cars. It's a nice to have but not in any way necessary. The only thing I'd need one is to know how far I'm from the bumper of the car behind me. Usually I drive as close as I dare to and when I go check there's at least a meter wide gap still.