This isn't a joke. A new app called LeftoverSwap, still in its beta stage, will allow you to sell/buy leftovers. Putting aside issues of health and a possible Contagion-like fallout, this here seems like... we don't know, really. How should we feel, internet? Angry? Annoyed? Pleased? Bereft? Pizza and pasta are excellent next-day items, sure; not so much, say, a sandwich from Darwin Cafe.

LeftoverSwap explains:

You hate the idea of throwing out food, but also don't want to be eating the same leftovers for the next few days. We understand. You want to reduce our dependence on fossil fuels and fertilizer as well. We also understand that.

Snap a picture of what you can't eat, name a price, and share the rest of your meal. Your neighbors are hungry.

It all began after one problematic night when Seattle entrepreneur Dan Newman had too much pizza and couldn't fit it all into the fridge. 99 problems, folks. Rachel Swan of SFoodie has more:

The idea really started to take shape after Newman hosted a couch surfer in his apartment who self-identified as a "freegan" -- meaning he only feasted from other people's plates, or from the spoils of dumpster dives. "That was enough to spark initiative in me," Newman says.

Then he did a little more research into the food system, and found that humans actually do waste tons of food -- up to 40 percent of what we produce, according to stats re-purposed on his website. [...]

Interesting idea if not a touch worrisome. Is it only relegated to restaurant-bought food? If not, what if someone hawks a loogie into our Cheez Wiz? (We'd buy your Cheez Wiz, provided your didn't do that.) Or what if a scam artist shoves a couple of tuna chunks and twigs inside a won-ton wrapper and nestles it in a demitasse of Campbell's Soup broth and calls it Benu? (That actually sounds delicious.) And more importantly, if you go to Mission Chinese Food and take leftovers home, in lieu of giving them to a homeless person on 16th Street, how do you stand to look at yourself in the morning?