Probably nothing will happen, but if you want perfect oven potatoes there is NO need to completely wrap them in foil or puncture them in advance. Lightly cover your potatoes with olive oil and season with coarse salt, place in hot oven 375 - 400 degrees, depending on the size of your potatoes, bake for 15 - 30 minutes and THEN puncture in just one to three places on top. Finish cooking for 10 - 20 minutes longer or until tender all the way through. You will have a moist, creamy potato just ready for butter, sour cream and chives!
The reason many baked potatoes are mealy and dry is because they are poked/punctured all over before they EVER go into the oven.
Blessings....