Ever want to pop off your hand and throw it across the room? Try Mage Hand instead. It's a cantrip that has an incredible variety of uses, and they're all fun as heck. Well, I'm sure you could fold laundry or something, but you're playing D&D here. Well, then again, if laundry's your jam, go for it. The lesson is there's very few situations in which you shouldn't cast Mage Hand.