Carlill Vs Carbolic smoke Ball co

“a wagering contract is one by which two persons, professions to hold opposite views touching the issue of a future uncertain event, mutually agree that , dependent upon the determination of that event, one shall win from the other and that other shall pay or hand over to him, a sum of money or other stake; neither of the parties having any other interest in the contract than the sum or stake he will so win or lose, there being no other consideration for making of such contract by either of the parties. If either of the parties may win but can’t lose, or may lose but can’t win, it is not a wagering contract