There are few things more irritating than arriving at the petrol station, getting out of your car, and paying - only to then realise your petrol hatch door is on the wrong side.
But a recent tweet shows there's a way to avoid that awkward reverse-shuffle-u-turn dance in your car you have to do to get close enough to fill up.
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The secret is in a little known symbol on your car's dashboard.
Hidden in your petrol gauge - between the letters signifying empty and full, and next to the little pump symbol - is a tiny arrow. Whichever way that arrow is pointing is the side that your petrol hatch door is.
If you're reading this thinking 'well, duh' - then congratulations. Not only have you spared yourself from many moments of irritation, but you're also in the minority, judging by a recent tweet that went viral.
After Yoko Ono requested "some advice that will make our lives heal and shine", this was by far the top-rated response - with some saying it'd "made [their] weekend" and even "changed [their] life".