Constant,
Could it have irritated him that there were not two in the fridge? I don't know if you smoke or not but I have quit on occasion and my reaction from one is wanting two...or put another way...another one. And another thing about my smoking analogy is if there is one cigarette anywhere in my house that I know about it calls to me. I find it, I smoke it and then they are all gone. I could become annoyed at that.
I don't think one beer made him an ass. He is thinking.
Make sense?
JT