When my son was about six he wanted to buy a particular book. While he was in the children's dept, I started to browse the travel books. having selected his book and paid for it, he came and stood beside me. Watching for a few moments as I took various books,read the back page and replaced back on the shelf, he said in a very large voice"Are you going to buy it this time ?" meaning was I going to buy the book instead of putting it back and selecting another. The shop fell silent as all eyes turned in my direction, We left very quickly,with everybody still watching !