How does NASA throw a party?
What can only exist through light, but dies when a light is shone on it?
Some months have thirty-one days. Even more have thirty. So how many months have 28 days?
All of them.
What is served, but not by a waiter; and an ace but not a card?
A volleyball: serving is a classic volleyball move, and a serve that drops without the opposing team touching it is called an ace.