Life's a Bihać
As opposed to its counterpart "Life's a bitch," this phrase is used after an unexpected series of pleasant or positive events have taken place. Used to describe the way life sometimes takes a positive turn when we least expect it. Bihać refers to Zoran Bihać, a German Film Director famous for his positive attitude.
Your friend: "I just got promoted and won the lottery in the same day!"

You: "Life's a Bihać."