That awkward moment when you have to wait for a penny change and don't really want to say "keep the penny" because it's like giving a really bad tip to the cashier or something, maybe it's against company policy so it makes it awkward for them, there's no donation box etc. And they're like "here's your PENNY!" and you're thinking "I knowwww"

Probably just me

They are useful in that they're probably good news for charities. I've had many instances of a bulging wallet full of pennies and just dropped them into the charity box to get rid of them.

Bring on the cashless society I say, let's have little proximity cards you can top up with £10 or whatever. Some banks have it but currently they rely on expensive terminals that only Greggs have.