It’s always amusing when the in-game party leader is a different person from the out-of-game leader. The most articulate player – or the one with the most decisive personality – is usually not the same person as the one with the high in-game charisma score.
I’d often have NPC’s assume things about the party leadership and see how the players handled it. I’d have NPC’s walk right past the party leader and start talking to the guy at the back of the formation as if he was in charge. This was always good for a laugh.