Scare Card

A card which may well turn the best hand into trash. For example, in hold'em say you have {10-Clubs}{8-Clubs} and the flop comes {Q-Diamonds}{J-Diamonds}{9-Spades}. You almost assuredly have the best hand with your straight. However, a turn card of {10-Diamonds} would be very scary because it would almost guarantee that you are now beaten.