Area Effect Danger Sense

Area Effect Danger Sense, n.: in any game where miniatures or counters are used, this phrase describes the metagame knowledge that the GM is drawing out the scene on the battlemat and placing characters on it in preparation of an ambush or combat.
Ex: Player: "We slowly open the door." GM: "Okay. Let me get my lead case." Player: "Oops! Area Effect Danger Sense! We're under attack!" [BN]
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Addendum: Originated in Champions games, but applies to any game where the miniatures are only used during combat. See also "What's your marching order?" [BN]