Oh, misunderstandings!  You are the curse of the social animal.  Sometimes funny, sometimes tragic, from minor to life-changing, miscommunications happen all the time.  Write an exchange of dialogue in which 2 characters are completely missing what the other person is saying.

Maybe one is being completely straightforward and clear, and the other is assuming subliminal meanings or ulterior motives that aren’t there.  Maybe they’re both playing coy, but misunderstanding one another’s meaning because neither one is being clear.  Maybe one is taking what the other is saying the wrong way, or seeing a threat where none is intended.  Maybe one of them is flat hard of hearing, and literally can’t tell what in the world the other person is saying.  Maybe connotation is in the way – what’s offensive or insulting to one person isn’t always a bad thing at all to someone else.

There’s the prompt.  Now see where it takes you!