There's this woman that comes in at least every week or so to where I work and uber excitedly asks for our hot coffee. Keep in mind that I work in a gift shop in a botanical garden and our hot coffee is basically a powered mix and hot water that customers make themselves. She always just asks for coffee and never buys anything from the shop or asks for admission into the garden. She's always ecstatic and giddy when we have it and looks like someone ripped her heart out when we don't. It's really quite odd and a bit hilarious. We recently had a little café open up in the park that sells actual coffee and when I told her about it it looked like she was going to have a heart attack from joy.
There also used to be a cute little old man who barely spoke any English who would come into the shop, buy a box of our souvenir chocolate and go into the garden to watch DVDs on a portable DVD player. I never understood why he would pay admission for the garden if he was just going to watch DVDs. He could do that anywhere! He didn't have to pay for it.
DK/DC/Don't work in customer service: Are you a "regular" anywhere? Do the people who work there recognize you and know what you're going to ask for? Do you have any very specific or odd requests at any of the places you frequent?