It sets Starscream's teeth on edge that he laughs, and he glares daggers, or energon blasters, or...whatever in Megatron's direction, totally prepared to snap back with some haughty rebuttal, until that totally unfamiliar name draws him up short, and his expression shifts into of sheer bafflement.

"Optimus who? What are you talking about?" He side-eyes Megatron hard. "There hasn't been a Prime in -- megacycles, at least. Who the hell Optimus?"