Puck was a character in
William Shakespeare's play
A Midsummer Night's Dream, also known as Robin Goodfellow. A bit of a troublemaker in the play, he puts love-in-idleness juice on the eyes of
Bottom[?] and then sticks an ass's head on him. He also sticks love-in-idleness in the eyes of the lovers.
See also: Puck (mythology)