A couple of years ago my Better Half went to Cuba to visit family. I handed over my Canon G10 after setting it in Idiot Mode. He did manage a few nice pictures, but there were a whole lot of them taken through the car window, and you could see a very strong reflection of his nice mint green shirt in picture after picture.
So I showed him the pictures and explained to him what went wrong. Then I told him that the next time he went to Cuba he should not take pictures through the car window anymore.
I am happy to report that he remembered what I said while back in Cuba last week. Now I got a memory card full of pictures like this one: