My two agouti's would do this when they were 2-3 months old. Finally my little girl got tired of her brother stealing all her food out of her mouth and after one afternoon he stole a tomato she thought was very tasty she sat in the corner, and slowly narrowed her eyes as she watched him eat and eat and eat.. then waited a few minutes then finally HOPPED across the hallway, smacked him in the head with her front two paws and RAN OFF. I was amazed. I didn't know she had it in her!!!
Wow, hilarious! I remember once with my sugar gliders, I was giving Tabitha and Lemmy mealies... he got his, then apparently I took too long getting her one, so she ripped it right out of his mouth! He looked utterly heartbroken and gave her the saddest look, then looked at me like "do something!!" lol. I gave him a replacement mealie for the one she stole.
This one amuses me no end - I just have to ignore the slight technicality of a rabbit not being a hare, yadda yadda yadda...They still make for funny puns!