There's a "Creme Brule" cart in my city (and now they've got a truck, and a walk-up shop window). It was a brilliant idea, and they seem to get enough business to keep 'em going and expand the business.
I wasn't expecting them to be there on a Sunday afternoon. So it was a delightful surprise to come down the block and spot them across the street. Delicious. And I love when simple errand running turns into a spontaneous little date.