yeah maybe its the tricking your friend into exorcising her mother figure so she'll marry you and yelling and threatening murder and all that. i might be wrong tho
One of my favorite details of all time in the ROTTMNT Movie is that when Casey Jr. is so angry, he either seems to not think right or does not care about hurting himself to unleash his anger. And it's so funny.
Consider the scene with Casey and Leo, the one after Casey chews him out.
After a little bit of time alone, Leo resolves to do better. While moving rubble, Casey finds a break in the wall with light shining through and understands it's a way out, so he focuses his efforts on that. Leo joins Casey at the top of the rubble pile, trying to help.
Casey is still steaming mad and gives Leo a hilarious glare before ramming into the wall to break it.
Now, remember where Casey's armor is. The shoulder armor is on his right. What shoulder does he use to ram into the stone wall?
His left.
Yep, he was so mad that he rammed into a stone wall with his unarmored shoulder when he has a perfectly good armored shoulder on the other side. This action also hurt him quite a bit, it seems, considering his expression.
(As a side note, it is true, you're really not supposed to ram your shoulder into things, you'll injure it. That's why it's common advice to kick doors down, not shoulder slam them. That's also why in contact sports, including hockey, people wear shoulder pads.)
It gets better, though. Clearly it hurt the first time so he wouldn't do it again, right? He can't be that stupid, right?
WRONG.
Casey is probably too angry and full of adrenaline to consider much or not try to hurt himself. So he rams into the wall the exact same way a second time. Really it's only when Leo tries to speak more openly here, admits his flaws, and agrees to work together that Casey pauses.
But wait, it gets even better. The third and final time when they break through the wall together...
HE'S STILL USING THE SAME SIDE TO SLAM THE WALL. 😭 He learned nothing. He just doesn't hurt himself too bad the final time because they successfully break through to the elevator shaft.
Not once within this scene did it occur to him to use his armored shoulder. Not once. Not even after it clearly hurt.