If you are going to steal your parents wine glasses or other alcoholic beverage then there is a certain amount you can take without being noticed. The amount you can take greatly increases with the number of glasses already consumed by the adult, as this graph shows: (it is hard to read but the y axis shows how many glasses drunk by adult and the x axis shows the fraction of the glass you can take)
This is only a hypothetical graph. Adults, please don’t drink as much as is on the graph because your children don’t want to have to carry you home and children, visa versa. Just in case a drink aware campaign gets it’s knickers in a twist. Also, your liver will hate you for a long time. It is a very touchy organ so I wouldn’t mess with it.