That doesnt sound fun.

I have gotten off a plane, and reboarded before though. I was in ATL and sat down in my first class seat and then realized I left my iphone cable in the SkyClub. I spoke with the FA and they checked with the pilot and let me go(I think they cleared it with the desk too). Luckily, the SkyClub was only one or two gates away. I sprinted to the club, ran up the few flights of stairs and made it back about 2 min before they shut the door. I was pretty impressed(and grateful) that they let me off the plane.