Sometimes I drink beer from a can, other times I drink beer from a bottle.
But the civilized thing to do is drink beer from a glass. Pour that beer from the can, the bottle, or the keg into a proper glass, and drink it that way.
Drinking the beer that rains down from the sky is not considered civilized. Only boors tip their heads back to drink, or wring out their garments into their mouths.
Raw, unprocessed beer is vile.
Let it flow into the drains, and get filtered in the processing stations.
Better safe than sorry, kid.
Cheers!