"Optimus, our past alliances-Autobot, Decepticon-no longer matter. Not while Unicron lives."
"The past always matters!"
"A truce between Autobot and Decepticon? How long do you expect us to believe that will last?"
"Only as long as it's mutually beneficial."
-Megatron, Ratchet, and Optimus, One Shall Rise: Pt. 2