You're on the plane, and your choice of movies is "Bride Wars" or "Mall Cop." You figure perusing the SkyMall catalog will be more entertaining, so you fumble for the light switch, and next thing you know, an angry flight attendant is looming over you, demanding to know what the problem is. Oops.

You hit the wrong button. Again. But the good news is, that probably won't happen in the new Boeing 737.
High-Tech Changes That Will Revolutionize Flying - ABC News