You're in the car with a friend after a party. You didn't really enjoy the party. You ask your friend if she could see that you weren't having fun.
“I bet you five bucks that you can't name all of the states in the United States without looking them up.”
You're babysitting your nine-year-old neighbor. You know kids like to compete, so you give him a fun educational challenge.
You're at your friend's birthday party. You've never met his girlfriend, even though they've been together over a year. You tell her how glad you are to finally meet.