Opening an umbrella indoors was considered bad luck according to some superstitions, as it was seen as an insult to the sun god. Finding an old horseshoe, especially with nails intact, was thought to bring especially good luck, and hanging it above a door with the points upward was believed by some to trap luck inside while others thought the opposite. Four-leaf clovers were used to ward off evil according to superstition, and finding one meant meeting a future lover that day.