A full ice tray makes me very happy. For some odd reason it gives me security. If the ice tray is almost empty I get worried. What if we run out of ice and I can't have a cold beverage? Oh no! We don't have an automatic ice maker, so I either have to make ice myself or buy it. For years I bought it, but then I figured if I just exerted a little effort I could easily make my own and save a few bucks a week. I drink iced tea like a mad woman and I have to have ice in my water, thus the happiness a full ice tray brings me.
Just thought I'd share one of my oddities with you :)