You see me in all manner of places and in all sorts of things, yet in not a single one of the things where you see me can i possibly be.

One's image in a mirror.

Riddle: It's 7:00 AM. You are asleep and there is a sudden knock on the door. Behind the door are your parents who came to have breakfast. In your fridge are bread, milk (pasteurised), juice, and a jar of jam. To answer, what will you open first?
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This has already been asked a hundred times.