That's not fair, Sebastian isn't human.
Maybe Hayate vs Kogarashi the maid guy would be a good one...
"Ojousama no tame ni, Boku o makerarenai!"
"Mite yo! Bakamono goshujin! (This is how he calls his master, Fujiwara Naeka!) Kore ga Ore no hontou no chikara! Kono Ore ga, Maido Guy!"