1 bottle of beer on the wall. Take one down, pass it around 0 bottles of beer on the wall.
Then someone goes shopping and you have
100 bottles of beer on the wall. Take one down, pass it around 99 bottles of beer on the wall
1 bottle of beer on the wall. Take one down, pass it around no more bottles of beer on the wall....![]()
...no more beer, only happens when someone forgets to go shopping....