There are many different ways to describe "stroke of luck," including a happy coincidence, a fortuitous turn, a fortunate happenstance or a serendipitous event. Additionally, some people might use the words windfall, boon or blessing to describe a stroke of luck, depending on the context and magnitude of the situation. No matter what phrase you use to describe it, a stroke of luck can be a welcome surprise that brightens your day. From randomly running into an old friend to finding an unexpected bonus in your paycheck, these small moments of good fortune can remind us to appreciate life's little joys.