A Metalocalypse episode concept I can see so vividly is one where the band finds out Charles is gay, and they start doing that typical straight guy “just don’t start hitting on me hahaha” thing. To which Charles reassures them that he’s professional and wouldn’t do anything to make them uncomfortable. Also they shouldn’t worry because none of them are his type.
That last comment causes everyone in the band to take psychic damage. They spend the rest of the episode obsessing and panicking over why Charles wouldn’t like them. Meanwhile Charles is just doing his job as normal.