Yesterday, my associate at the office where I work complained to me that I always rant and rave about Obama and his MDS (Marijuana Deficiency Syndrome)- implying that I was getting redundant.
There is a pond close to my house that is stocked with goldfish. I visit often, but only occasionally do I feed the fish. After awhile, the fish seem to recognize my footfall and gather close to the feeding area. This intermittent reward has found to be the strongest kind of conditioning for both animals and humans.