How I explained MapReduce to my Wife?

Yesterday I gave a presentation at Xebia India office on MapReduce. It really went well and audience was able to understand the concept of MapReduce (as per their feedback). So, I was happy that I did a good job in explaining MapReduce concept to a technical audience (mainly Java programmer, some Flex programmer and few testers). After all the hard work and a great dinner at Xebia India office I reached back my home. My wife (Supriya) asked me “How was your session on …” , I replied it went well. So next she asked what was your session all about (she is not in software/ programming field)? I replied MapReduce. MapReduce !! what is it? She replied “is it something related to geographical maps?” . I replied No No.. it has nothing to do with geographical maps. So, She said what is it? .Hmmm… I said lets go to Dominos (A pizza chain) and I will explain it over the pizza table. She said great and we went to pizza shop.