..............................or starting, but not worrying about finishing, a book:
It should be ruthless, taking no prisoners and offering no mercy. Similar to dating, a book you’re not into after 10 minutes of attention has little chance of a happy ending. Slam it shut and move on. You’re not a failure if you quit a book after three pages anymore than if you reject the proposition of a 10-hour date with someone you just met who annoys you. Lots of fish in the sea.
Lately, I've fallen into the habit of reading the first chapter, then the last chapter, then deciding if I want to read the rest. Seems to be a fairly effective sorting mechanism.