You-oughta-know-it's-annoying filter. →[More:]When you call someone from your cell phone and you can't hear them when they answer, call back. ONCE. Because if you can't hear them the second time, there's a good chance that you won't be able to hear them the third time, or the fourth time, or the fifth. And five phone calls in two minutes where no verbal information is exchanged is entirely too many. Wait 15 minutes until you have a better signal. Please. You oughta know.
Other things people oughta know are annoying?