uhhh, kinda.
its called 'celebrity bartending' when your friend owns the bar and has to run take a piss and youre a regular like Norm from Cheers, and they ask you to get behind the bar so no drunks steal uit. or if its too busy, he asks/she asks you to assist in making drinks because its too packed.
yeah ive spent many many hours behind bars swerving drinks with friends on busy nights.
got paid some nights too hahaha never held an official title of Bartendar though.
