Frank The Tank T-Shirt From The Movie Old School. Who is frank the tank you say? He is a mysterious fellow who will portray many alias in order to obtain a free party including girls, food and large amounts of alcohol AKA Will Ferrell's lovable character in old school! Oh yeah, you know who he is he's Frank The Tank, and he's coming to crash a party near you. Did anybody mention frank doesn't only crash parties but funerals as well? That crazy bastard really knows how to pull it off!