I have black tarry stools after a night of partying?

Too much 'partying' Did you take any pepto before you went out 'partying'(which can turn your stool black), or did you drink to such excess that you caused bleeding within your esophagus/stomach? If you are young and otherwise healthy, and this happened only once, i'd advise caution- if you are light headed, dizzy, or this continues to happen, get to the doctor at once.