If you are stuck on a phone call and you want to come up with an excuse as to why you need to go right away, check out http://www.sorrygottago.com/. This is a website that offers a bunch of audio files that create background sounds that will lend truth to your excuses on why you need to cut a call short. You can fake sounds like someone knocking on the door, your ride showing up, car alarm going off, fire alarms, etc. If you need to get out of a phone call without being obvious that that's what you are doing, this site can help.