When someone asks you a question that you would have no chance of knowing, yet they still expect an answer. Often just them thinking out loud.
friend: Hmmm... what flavor ice cream will I like?
me: I'm not your taste buds.
is an example of a killers
When you say something to someone, and they repeat the same thing back with a question mark after it, forcing you to answer "yes". Somewhat related to killers.
Me: I'm gonna move out next month.
Friend: *Gasp* You're gonna move out next month?!?
Is an example of a jaw breaker