What follows is a conversation I just had with 2 separate co-workers about lunch, a very important topic in our office. Some days we begin discussing lunch plans before we even have our morning coffee(tea for me).
CoW1: "Didn't you bring anything? I brought a burger."
ME: "Nope, it'll keep."
CoW1: "Right, then I won't have to bring lunch tomorrow."
See how well we rationalize things?
Conversation I had with my second co-worker inviting her along with us:
Simple and to the point, that's the only way to be.