I can understand drinking,cro-magnon man eating fermented apples or fruit,feeling a little bit merry and less inclined to pulp his neighbours skull with a mammoth jaw-bone or flint nodule,probably thought"f*****g hell,Ugggg,this is great"and started trying to ferment his own fruit,could have been the first home-brew kits,but even he must have coughed and spluttered when his missus built the fire out of wet wood and the cave filled with billowing smoke