Sleds? Yeah, I live with a family of sleds. There are some that live upstairs in a closet, the rest live in the basement. They are a reliable group, and can go from "in the bag" to "ready to fly" faster than Clark Kent could become Superman. I try to make sure they get plenty of exercise, and they seem happiest when lifting something. Since everyone can't fly at the same time, I have to rotate who gets to go to the park. If I don't, one of them might get disgruntled and start corrupting the deltas. And I don't need that to happen. ...again.
For the record, I love all the sleds equally. And I'm not just saying that because there is one in the room with me now.