(Melting ice.) Other types of necessities (in conjunction with putting frozen liquids and warm areas): child, oneg Shabbos, etc.
Hanging up a Child's Swing, Cutting off Part of a Candle to Fit into the Candelabra on Yom Tov, Cutting Part of the Wick...
to clog a small crack in a pipe. Turning off gas range. Putting on, taking off smoke detector. Unscrewing the bulb that's off;