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I do this too! Only sometimes I confuse myself and end up looking like an idiot.

I picked that up after I spent some time in China, where it's a common enough thing that nobody thinks twice when you do it. But back in the US, it gets a lot of strange looks.

Not really connected to programming, but: I used to always grab 3 quarters, 2 dimes, a nickel and 4 pennies. That and the M&M thing...

Me too, only it's easier here because 1c and 2c coins have been removed from circulation so you round to the nearest 5c.

where is here?

Australia

God Bless Australia. I love that country, and I really liked how tax is already included in all prices and payment is rounded to 5c since there are no 1c pieces. It makes payments so much simpler.