Hadn't planned to, but:
We usually go out for Breakfast on a Friday as it's my wife's day off work.
Ordered and went our table, wife looks at receipt and says we've been under charged.
I think she's got the order wrong and asked for small breakfast instead of regular.
Go back to the counter to see if we can change the order, to be told "half price today, it's Black Friday"
I'm happy with that - and it was a nice breakfast.