Caper has two main meanings:

1. A playful, mischievous adventure or scheme. When kids plan a caper to sneak extra cookies from the kitchen, they're plotting something fun and a little naughty but not truly harmful. In movies and books, a caper often involves a clever heist or elaborate trick, like sneaking into a museum after hours. The word captures that sense of adventure mixed with rule-breaking: not serious crime, but exciting scheming that requires cleverness and daring.
2. A small, pickled flower bud used in cooking, especially in Mediterranean dishes. Capers taste salty and tangy, adding a sharp flavor to foods like fish, pasta, or salads. They grow on shrubs in warm climates and get pickled in vinegar or preserved in salt before they reach your dinner plate.

When you're planning a caper, you're jumping into an exciting scheme with energy and spirit, usually with a wink and a grin.