Lagniappe /(?)/

La·gniappe

Lagniappe

n.
  1. In Louisiana, a trifling present given to customers by tradesmen; a gratuity.
    Lagniappe . . .is something thrown in, gratis, for good measure.
    — Mark Twain.
  2. A tip or gratuity.
  3. Anything obtained gratuitously or unexpectedly.