rabbits can and will eat corn. they will gobble it down.
it is also my experience that it will give them the serious s**ts, and like was mentioned will it will screw them up. they will drop weight FAASST, and not recover quickly.
if just a couple kernels, no harm. moderate amounts, even, and you're taking chances.
this is my experience, you can take your chances. rabbits will eat corn, but they don't just pull their chairs up to a pile of corn.
i'm sure not all rabbits will react badly to it, but i'm dealing with one right now that my daughter gave corn to. not pretty. she went from fat and healthy, to anorexic looking, buggy eyes and her head looks like it's floating
i'm feeding her a bunch of hay (not the rich stuff, either), and she is doing better, but it is amazing how quickly she dropped weight