Life is a roller coaster. You can either scream every time you hit a bump or you can throw your hands up in the air and enjoy it. Life is a waste of time, time is a waste of life, so get wasted all the time and have the time of your life. Life is full of surprises. Life is hard, no one makes it out alive.
Life is like a game of cards.
Life is like a grammar lesson. You find the past perfect and the present tense. Life is like a ladder, the higher you climb, the more expansive your view is. How good you do depends on your critics. Life is like an onion.