It might even be a dual optical/analogue audio socket as seen in the Macs and ATVs
- Better in your pocket as it's the right way up when you remove it
- Better in a car as the 3.5mm cable drops straight down from the dash or window
- Better for people using headphones with no mic built in so you can hold it with the bottom edge towards your mouth
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All of these things are completely backwards for me. Not sure how you see upside down as right side up.