Quarter Stuck in Disposal

I have a quarter stuck under one of the blades in my garbage disposal.  I have tried manually turning the blade from the top with my hand, a screwdriver, needle nose pliers, a hammer handle, and a monkey wrench handle (it fit right between the blades).  I have also tried an Allen wrench to loosen the blade from the bottom of the disposal, but it won't budge.  I used the pliers and a slotted screwdriver to try and propel the quarter out from under the blade.  Nothing is working.

Any ideas?

Katie