Act 2, Scene 2: As father and son speak to Bassanio, Bassanio becomes exasperated. What makes this scene comic?

Both Launcelot and Gobbo are taking too long to get to their point. They want Bassanio to take Launcelot on as his new servant but keep skirting the issue, One of you do the talking. What do you want? There is some comedy in Launcelot and Gobbo trying to speak at the same time while trying to say the same thing.