Bulleribock or bulleri bock is a Swedish children's guessing game for two people. The game is played as follows: person A turns his back to person B, who taps both hands rhythmically on A's back while saying a rhythmic, rhymed chant: Bulleri, bulleri bock, hur många horn står opp? (lit. bulleri, bulleri billy goat, how many horns are standing up?). B then stops drumming, but keeps some of his fingertips on A:s back. A then guesses how many fingers are pressed against his back. B responds with a chant corresponding to the right or the wrong answer, and the persons switch roles.