I have two that are rather situational. First, when the healer in the party went down, my wizard snapped off a Bear's Endurance to give him the hit points needed to wake up and heal himself. The second one was when we were facing a BBEG who kept using scrolls. He had a whole bag full of them, so I covered him in faerie fire and then dropped invisibility on him. His gear turned invisible too, no more reading the scrolls...
Also, I have made a grapple check to grab hold of an enemies armor, then teleported 10 feet behind our fighter. Took the armor with me and left the poor schmuck to face our melee guys in his skivvies.