You're about to complete the ultimate Curbly How-To DIY post, and you think, "Man! Wouldn't it be sweet if I could hang my camera from the ceiling, and take a photo of me actually working on it?!"
Or, you're planning to scale Mt. Rainier, and you know you'll want a photo of you and your backpacking buddies, but there's no way you're gonna lug a tripod in your pack for 14,410 feet.
Or, if you're not totally allergic to all things furry...