I saw from my alarm clock that it was time to feed my fish. I tend to feed them every day at 5:00 pm. I walked over to the tank to see how they were doing. They were swimming around and ready to be fed. I grabbed my jar of fish food and screwed the cap. Then I scooped out just enough food to feed them for one day. The scooped food went right into the water. My fish were in a slight frenzy to get fed. They swam all at once to the surface to eat up the food that I had given them. In a short while, most of the food had disappeared from the surface of the water. The fish appeared to be eating healthily so i began to put things away. I then closed the top of the tank, and replaced the cap on the fish food. I put the food away for another day. 
Question: How did the food end up in the fish tank?
He opened up the lid and put it there.