Was Starscream really trying to convince him that he was a loyal and trustworthy person? That was rich.

"It has been mere minutes since Megatron chose to accept you back to the Decepticons, moments after you confessed your appalling transgression against my brother. You cannot truly expect me to believe that you speak the truth? Your dedication to spreading falsehoods is sickening. Megatron has made a grave mistake, allowing you to live, one I intend to correct."