Taking the biscuit!
It is afternoon tea time in England. This afternoon, I have a selection of 8 different (and delicious) biscuits to enjoy with my afternoon tea. I can have as many of these 8 biscuits as I want. In how many different ways can I possibly eat the biscuits with my tea this afternoon?
Details and assumptions:
I may have no biscuits if I want.
The order in which I eat the biscuits matters.
I don't actually enjoy tea.