As much as Apple is praised for simple user experiences, there's a lot about my mac that bothers me. For example, when I am browsing through photos in Preview (with arrow keys) and I come across one I do not want, I should be able to hit the delete key to delete the photo, but no, I can't do that. I have to stop browsing, find the photo in the side bar, right click and select 'Move to Trash'. Or, when I close all the windows for a given program (usually there is just one), the program stays open until I navigate through the menu to explicitly quit. I understand this is a design decision, but it just seems counter-intuitive, as does much else with this computer. Things like this annoy me all day long.