Signing up for wedding registries can be tough for couples who don't really need anything. Maybe they live in an apartment and can't fit a host of new kitchenware and don't need anymore towels. Maybe they prefer buying secondhand as opposed to new, and maybe they don't like other people shopping for them.
However, if there's one thing everyone can get down with it's pizza, which is exactly why Domino's now has a wedding registry for pizza.