It's not unusual for two people to share a bottle of wine, but when you have a third guest one bottle might not be enough anymore. Let's say we're having a wine party where every guest drinks the same amount of wine. Now suppose as a rule that for any wine party we need exactly one less bottles of wine than the number of guests. Notice that for larger and larger numbers of guests, the amount of wine per guest approaches one bottle (750 ml). In fact, there is some finite number of guests where the amount of wine each person gets is, in human terms, imperceptibly different than a full bottle of wine. But how can that be when we KNOW we bought exactly one less bottle than the number of guests at our party?

Now take this a step further. What if we buy two less bottles than the number of guests? Three less? It seems like for any finite number of bottles less than the number of guests at your party, there is some number of guests you can invite where each one gets arbitrarily close to 750 ml.