This can be unlocked on the level "Chicken Barn"
After you buy the catapult and launch a chicken to the upper level of the barn, you transition to the other side of the building. Catch an egg that launches from a tube and catapult it at a switch on the open 2nd floor door. This will cause eggs to launch from the tube at a rapid rate. Move your hole out of the way (don't catch any eggs). The eggs will be destroyed on impact with the ground. It should only take about 15 seconds to allow 3 dozen eggs to break.