When Holly has traveled to Ireland and has a local spending the night. She goes to pour herself a drink for some courage and misses the glass as she pours. She offers him one and he says "What am I supposed to do, lick it off the counter." Shortly after that, when it goes back to her the glass is full of liquor then in the next shot it is empty again. There is only the one time when there is any liquor in the glass.