My friend Chris threw out his back bending down to grab a napkin at his sister's wedding. He spent the whole reception standing against a wall while everyone danced, just because of one stupid muscle. It really does feel like the universe picks the most dramatic time for things to go wrong.
Throwing your back out is bad, but calling it a dramatic universe plot is a stretch. People get hurt doing normal stuff all the time. It's just bad luck it happened at a wedding. The real drama is making a muscle spasm into some grand cosmic joke.