Nemesis Prime: I'm the real Optimus Prime, shoot him!

Optimus Prime: The only way to keep Earth safe is to shoot BOTH of us!

Arcee: [Aiming at the clone] The REAL Optimus Prime would never pass up an opportunity to unnecessarily sacrifice himself!

Source: Tumblr

Submitted by: Stardust948

(Personal favorite. Also the real Optimus Prime never uses contractions haha)