I almost died on Flathead, on the rap after doing the SW Butt. I'd rapped to a ledge and was looking for the next anchor when some dinner-plate sized rocks peeled off the ledge where the rap anchor was. Barely missed me but chopped our ropes in half. Took like 20 raps to get down after that.
South Face of Flathead, My Mom's Muscle Shirt, is still the best Grave IV around though.