Things don't always go the way we expect them to.
For instance, roller coasters twist, and turn, and screech, and fly, and we never expect them to go where they go. That's what makes the ride so fun! We want to be hurled into action, spun in circles, turned upside down. That's the thrill of the adventure.
Life is just like a roller coaster. We get ready. Buckle up. And, before we know it, we're hurled into situations that take our most intense concentration not to scream, vomit, or cry.
Then, when all the loops seem to have passed, we climb the huge hill. We go slower, and slowerr, and slowerrrr, until finally, when all hope seems lost, and further ascent seems impossible, we reach the crest of the hill, and are thrown down the slope, into the valley below. After this, another series of impossible twists and turns, and loops and curls.
Soon, we're all settled in, and ready to ride forever. Either that, or too numbed to protest. That's when we coast to a peaceful stop, and are told that it's time to buy new tickets. I don't know where that fits into the analogy, but that's up to you to decide.
Life's like a roller coaster. Right?