The difference between AM and PM is "A" and "P". Now, we all know A&P is some sort of southern grocery store. As HTM is poor and hungry, he is going to steal some food from people by threatening to park his Focus in front of their house as they come out of the grocery store.
Following our line of logic to its conclusion, the difference between AM and PM is a can of tuna, some doggie biscuits, and some hair gel.
BTW, Knu's story is funny. I can just imagine some little dog tied up with 1/0 not even being able to lift its head off the ground.