Back when I drank I bought a decent breathalyzer. It was entertaining to sit around and experiment. I weighed about 235. What I found is that I was very happy and quasi-functional at .08 to about .12. More than that was a cluster*. I could barely feel the effects at .04. It took about 3 quick bottles of Heineken to get to .04. Two more bottles and I saw .08. Interestingly, drinking a glass of water before blowing about halved the BAC reading.