All this time, during the forest scene, Optimus called Megatron a "junkyard troll." Nope! It turned on the subtitles and he actually said "junkyard crap!" So I was like wha? Then I listen to it very carefully and it turns out that he did! It's just that Megatron went "Ooohhh!!!" when Prime said it which made it sound like Optimus said something completely different.
Wow, that's the harshest word I've ever heard Optimus use. O_o