Window flags.
I first observed this noisy way of wasting fuel in the US, but it appears to have caught on in the rest of the world. Like many other wasteful things the US exports.
The only window flag that should be allowed is one that will warn other drivers that the owner is mentally/socially handicapped.
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is
where you're going, not
how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread