What are your favourite super low calorie snacks/meals?

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I used to have a list of these for those days that we had a "cheeky lunch" at work so I'd come home and have a light dinner.

Tonight I had a cup-a-soup and two hard boiled eggs (white only) - 65 calories and I'm very full! Obviously not nutritious enough to have on a regular basis, but a nice standby for when you're a) not that hungry and b) low on calories.

What other ideas do you guys have?