Pardon Us (1931)

It's Prohibition, and the boys wind up behind bars after Stan sells some of their home-brew beer to a policeman. In prison, Stan's loose tooth "buzzes" when he talks and keeps getting him in trouble, because it sounds like he's giving everybody a rasp- berry. But it earns him the respect of The Tiger, a rough prisoner, and the boys manage to slip away during The Tiger's escape attempt. They disguise themselves in blackface and hide on a cotton plantation, but are recaptured when the warden happens by and here's Stan's buzzing tooth which causes to realize who the pair are. Back in the big house, they find themselves in a hail of bullets, caught between the state militia and gun-toting prisoners, when The Tiger tries another escape. Eventually the boys are pardoned by the senior warden, who erroneously believes that they intentionally warned the prison guards of the impending firestorm by firing the first shots.