When we come home from grocery shopping, we place the groceries on the floor next to the fridge.
Until this moment, Lefty (the 22 yr. old) can be found in one of three places...his bed (most of the time), at the water or food dishes, or the litterbox. He cares little for the other happenings of the house, he only cares about eating, sleeping and pooping...except for the return from the grocery store.
Less than a minute after we put the groceries down, Lefty is up. He joins me at the bags and supervises the entire process of putting the groceries away.
I have no idea why...we don't buy anything for the cats at the grocery store, he gets no treats at this time, and I'm too busy to pet him. Still...every week...he watches the groceries get put away.