I have a photo that isn't a very big mystery. I'm sure many people will recognize it right away, but it made me laugh with surprise when I saw the object I have photographed, and I think that some people might not know what it is. And before you see the picture, it's a little bit like a riddle.
Almost every airplane I have ever flown has come from the factory with one of these equipped. I am usually glad that it did, and would be inconvenienced daily if it had not, because I use the functionality. I sometimes wish that airplanes came standard with two. But this is the first time I have ever seen one still installed on an airplane I have flown. What is in the picture?
So see if you can guess what it is without the picture, and post your answer below. If you need to see it, click here for the picture, answer what you think it is there. If it's really obvious what it is, and you don't want to spoil the fun for others, just tell us you know what it is, and keep the others guessing.
Don't read any of the comments before you have formulated your guess, or it might spoil the game for you.