It is bad to try to bait someone into cheating.
John puts a huge bet on Karl's boxing opponent, and gets the chance to meet Karl before the fight.
John wants say something to Karl.
John tells Karl good luck, and wishes him the best.
John tells Karl that his life depends on the bet, and he needs to throw the fight.
Karl smiles and says thank you and John sits back to watch the fight.
Karl gets mad and security kicks John out of the arena.