Why haven’t any of the major chains thought about doing this?  I suppose the cost to add extra perforations to the box isn’t worth corporate’s time but I wouldn’t mind paying a couple quarters extra for encouraging better use of resources.

1. No need to use extra paper plates.  Or waste water/soap/energy washing dishes
2. Pizza box doesn’t take over the entire fridge! It’s hard clearing out an entire shelf and I’m lazy.  If you do relocate the leftover slices we loop back to #1 with having to use foil, plastic wrap, or tupperware
3. This is just coolness.  I tend to be easily amused however.