Dragon shapechanged into damsel, damsel baleful polymorphed into dragon. Priceless.
I once had a party guarding a churchyard burial site on an island. There were two bridges. One party member on the tomb, one lurking about, one on each bridge. They were trying to protect the tomb from a teenage girl witch (the adventure was the first one in the witchfire trilogy). So a teenage girl comes running across the bridge toward the party paladin screaming as a group of shambling undead chase her. The paladin doesn't even detect evil, just steps aside and lets her pass, taking a stance to guard her against undead. Gets a magic missile in the back and more undead coming up out of the water on his side of the bridge. Great moment.