Tip for Getting Corn Off the Cob
To remove corn kernels from the cob using a bundt pan, stand the shucked corn cob upright, with the tip of cob placed in the center hole of the bundt pan.
Holding the cob steady, use a sharp knife and make long downward strokes on the cob, separating the kernels from the cob.
Many bundt pans have a stick-free interior. If this is the case with yours, be careful not to scratch the interior of the pan with your knife. If the knife scratches around the edges of the bundt pan hole, that shouldn't be a problem, as when you use a bundt pan baking, this area doesn't usually come in contact with the cake batter. (Note from the comments, you can tuck a paper towel or dish towel into the hole to protect the pan.)
So do you have any other ways?
Similar method: Instead of the bunt pan use a large mixing bown with an iverted paper bowl inside of it.