At the local grocer, they make the best house brand. The boxed variety are wonderful to look at, but the store brand is cheaper and just as tasty.
While passing through the check-out, the cashier ringing up my purchase and I had a discussion about our love of and inability to eat just one piece of this stuff. She animatedly told me about arriving home with her cello-wrapped, candied fruit and sultana raisin-stuffed parcel, and making a hot steaming cup of coffee at the end of a long day. Looking forward to her first bite after the ritual unwrapping, she said "It's always the same thing, I think..I'll just have a little slice with a slight dab of butter....and then, I say, I may just have another piece, - but only a sliver." At this point we look knowingly into each others eyes and start to giggle.
The problem with panettone is that you simply can't eat "just one piece". Several subsequent discussions have revealed exactly the same results. Panettone lovers have been know to eat so much at one sitting that they become a little overwhelmed and can't look at another piece until the next festive occasion.