I must admit, I am so confused
Say you are a kid (you always were a kid once!
) and go to a mall with parents for shopping. You see an icecream parlour in there, and couldn't resist running towards it. Your dad gives you moderate warning about being ill but you barely care. So you go, and see there's a season offer: pick up any flavour of icecream, without any cost.
Now, you love chocolates also. So chances are there you go for a chocolate flavour. Then again, you