Boy, we live in an incredible world. Society has created an infrastructure designed to help those that need it. Science has created all manner of convenient gadgetry, and you can always ask your elders for answers to some of the more confusing questions... That is, unless you're in a work of fiction. Then you can expect all this to be, well... useless. Here's a bunch of not-so-useless tropes about useless things, thrown together for the convenience of... someone else. For you, it's useless. Or maybe not.
Not so useless now, is it?