It was one of those days ... First , we go by one of those big box pet stores to get some cat food . Yeah , so sorry kitties for the half rations last night . I just could n't face going out at 7:30 pm to get you more food .
Question: What 's the most likely cause of why the kitties were fed the way they were the night before ?
The answer to the above question:


There was n't enough cat food .