A scene from Taco Bell:
Miss I: Momma on my side of the table. No your side of the table. Not YOUR Momma, MY Momma. Not YOUR pink lemonade, MY pink lemonade. Not YOUR taco, MY Taco! Not YOUR cinnamon twists, MY Cinnamon twists.
(Little bun successfully ignores these provocations for the longest time he's ever ignored them -- usually "My Momma" is enough to stir his jealousy from his depths and send him into a roiling rage).
Momma: Little bun, I'm so proud of you for not giving in and responding out of jealousy.
Which all leads up to the best sibling rivalry moment ever:
Miss I: (screaming) Not YOUR jealousy, MY Jealousy.