If someone says that you can whistle for something, they are determined to ensure that you don’t get it.
It’s not possible to whistle on the moon as to be on the moon you need a spacesuit and the pressure is only 1/3rd of atmospheric pressure.
Some pub tankards used to come with a whistle on so that you could request a refill by blowing your whistle – hence, wet your whistle and whistle for it.
If you can’t be bothered to get up early to photograph a red moon – whistle for it – or whistle it up.
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