Golems, pretty terrifying in their own right (and, I've heard, broken in design), are immune to any spells or spell-like abilities that allow spell resistance and have DR 5-15 / adamantine (and crushing for Clay).
Does a Ring of the Ram's damage (Xd6 Force damage for X charges spent, where X is a max of 3) hurt it? As far as I can tell the ring does not allow spell resistance, and since it's magic it bypasses DR, but it seems so wrong that such a simple item can hurt a CR 13 Iron Golem.
One of my PCs, a sorcerer, cast Ice Storm. Ice Storm deals part bludgeoning damage and part ice damage. Since all of the damage is created magically I assume that none of the damage bypasses a Golem's immunity to magic, even though the bludgeoning damage is "mundane" (i.e. a heavy thing hit it on the head.)
P.S. I may stop using Golems in the future.