Have you ever heard the expression, "You can go pound sand"? I learned it recently. ("Tell him to go pound sand." "Whuh?") That's a weird one, basically the equivalent of telling someone to "Go to hell" or "Go frak yourself" or "Go fly a kite" or "Buzz off" or "Go take a short walk off a long pier". Hmm, what is it about the expressing of hostility that induces such a rich and varied use of metaphor? Are we at our most poetic when we're at our meanest? Curious, curious.