At What Point Do You Not Turn Around For A Forgotten Phone [POLL]

At this point, pretty much everyone has a cell phone. I saw on Facebook yesterday that one of my friends had bought a Trac-Phone for her 1 year old to play with! We can't live without these devices and they are all but attached to our bodies. So what happens when, by some dark force of magic, you forget your phone at home?

Last week I forgot mine because it was charging and I was about a minute away from the house and I didn't go back to get it. There are many people who would have turned around. There are also many people who would be near their destination and turn back to get it. At what point do you not turn around though?

What if you are going on vacation and you are travelling a few hours away? At what point in time will you not turn the car around to get your phone?