Want to make me furious and ill-mannered?
Call me up at 3pm on the 4th of July and say,
"HI! Remember how you said we could watch the fireworks at your place? And how we said we would rather go out instead? Yeah! That conversation we had back in May... that's the one!"
"So yeah, anyway we changed our minds. We think we'll be over at about 8:30. See you soon!"
See you tomorrow.