Two of my friends have bunnies, and just recently I saw them interact. The larger bunny did not hesitate to charge towards the cat. The cat looked surprised but stood his ground. I wasn’t surprised when the cat swatted at the bunny, who then ran back into his cage.
I decided to check youtube to see some videos of cats and bunnies, and found this video.
By the way, I don’t endorse the interaction between bunnies and cats, especially if they are left unattended. Bunnies are apparently rodants, and cats generally hunt any type of rodant.