Bet your partner something sexual in nature and then go outside. Pick a certain item such as a red canary or a squirrel or a butterfly. Whoever is the first one to spot the object and yes, it must be verified by the other party to prevent cheating, wins the game. If you really want to get creative, play that old favorite, "Cars", and pick a certain make or model of vehicle beforehand. Whoever's turn it is when that type of car drives by is declared the winner.