You and a friend are about to play basketball against each other. Your friend asks if you're worried that you're going to lose. You want to tease your friend, so you threaten him.
You're talking to a woman at a party who you've never met before. You want to know more about her. You ask this to find out what her job is.
“Look at the size of those teeth! Man, I wouldn't want to come across one of those out in the wild.”
You're watching a documentary about tigers. There's a shot of a tiger that looks really scary. You imagine how dangerous it would be to be close to a tiger like that. You comment on it to your nephew, who's watching the show with you.
You have a small shop where you sell furniture. You're going to advertise your shop on the Internet. You want customers to think that you're friendly and that they can trust you, so you write this in the ad..
You're a student. One of the other students in your class compliments the professor on his lecture. You think she's just doing that so that she'll get a better grade in the class. You think it's distasteful, so you think this.