Memory Game Idioms 2Online version Players will try to match the idiom with it's meaning. by Lunarn Smith It’s not hard. It’s not rocket science Happens very rarely; uncommon Good idea or invention Once in a blue moon Best thing since sliced bread Ants in one’s pants Tell a secret Work until late at night Can’t stay calm (relax) because you’re nervous Burn the midnight oil Wait and be patient Hold your horses Cost an arm and a leg Don’t start problems or cause trouble Very expensive Let the cat out of the bag Let sleeping dogs lie