"Are you referring to the fact that you can't walk across a flat, stable surface without finding something to trip over?"

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Enter, stranger, but take heed Of what awaits the sin of greed, For those who take, but do not earn, Must pay most dearly in their turn. So if you seek beneath our floors A treasure that was never yours, Thief, you have been warned, beware Of finding more than treasure there.

— J. K. Rowling