On a recent flight I thought I had my wireless phone shut off. Hours after the flight I discovered it's still turned on all day long! Of course I did not do it on purpose, and the pilots did not have any problems; but I always wondered as some commentator: why can such a small equipment affect industrial-sized equipment?
On another flight I saw a guy had a thing in his waist which always had a glowing green light
For the details of my trip, see
http://www.airliners.net/discussions/trip_reports/read.main/3905/ , thanks!