On some beer bottles I’ve seen, on the lable where the deposit amount is listed, there is a “ok+” listed. What the heck does that mean? Anything to do with the alcohol content? Anything to do with the state of Oklahoma?
The law in Oklahoma on selling beer in grocery or convenience stores dictates that the alcohol content should be about half of that sold in other states (I forget the exact proof number). I think the law on buying beer in bars is the same as for grocery stores. IIRC, the only place you can buy “normal” beer is in liquor stores. I’m not familiar with the “ok+” on the bottles, but I would suspect that the symbol in question indicates that the beer was purchased in a liquor store. This can get you into trouble if you live in Oklahoma for a time, get used to drinking a certain amount of beer, and then move back to a “normal” state. 
If you are wondering, yes… beer manufacturers do have to make beer specially for Oklahoma.
Things are random only insofar as we don’t understand them.
There are several states that require 3.2% beer to be sold in convenience stores.