Hahah we have similar "custom" with my friends...there's this one disgusting beer in Slovakia and always when we go somewhere for couple of days, we buy couple of packs of it among the other good beers :D and of course noone even touches it the whole time..and usually last day, when all good beers are gone, someone suddenly appears with that beer in hand :D we call that person a "black Peter" :D...but yeah, we eventually always drink all the bottles :D