One for the Water Temple on OOT. Paralyze a tektite, give it a few seconds, and line yourself between the tektite and the water. Perform Din's Fire when the tektite is about to move again. It should bump you into the water, you'll sink to the bottom and perform a ball of fire underwater.

Not particularly useful, but neat, nonetheless. If you do Din's Fire on a moving Magic Bean platform the camera stays in one spot temporarily, so it looks like a flaming, floating ball hurling through the air.