"I was holding it for somebody else"

True Story when I was a Freshman in College in TN. I was 18 and went out with my Fraternity Big Brother and some friends to a bar. BB had went to the restroom and asked me to hold his beer while I waited for him. I didn't think about and he didn't think about. Next thing I know some no-neck bouncer grabs me by the scruff of the neck and wanted to know where I got that beer. Before it could come out of my mouth I just sighed and looked at him and said "you wouldn't believe me if I told you, where's the door?"