So awhile ago me and 2 other friends of mine were drinking one night(keep in mind I was 20 and my friend who bought the alcohol with my money was 21) and as the night started I was mixing cocktails and then we moved to the garage and my friend who bought the alcohol was the one pouring shots(he doesn't drink much because he is type one diabetic and has chrons disease so alcohol isnt the beat for him in big quantities) and he was pouring half shot glasses of 151 proof or 75�v everclear (in Michigan 75% is the max that can be sold here) and the he poured the rest of the shot with deep Eddy lemon vodka,now if you know anything about everclear you know it is meant to be diluted and says so on the bottle but anyways we were taking shot after shot and the vodka was 40% abv and if it is as cut and dry as adding the percentages then we were taking 115% abv per shot and it probably isn't that easy to add both numbers but that is the only time I have ever blacked out from alcohol and in the morning the bottle was empty yet i didn't wake up hungover in the slightest nor did I throw up and I never drink light, is there a reason i wasn't/haven't been hungover such as metabolism or other factors?