This is My all time favorite Optimus Primal vs. Megatron confrotation in The BEAST WARS Series it's in the series finale episode "Nemesis"
*Primal flies into the control room of the Decepticons spaceship The Nemesis
Megatron: Well, come on. Let's have it. The usual "Destiny and Honor" speech.
Optimus Primal: Speech this.
*Optimus punches Megatron in the face*