Dear Punxsutawney,
If one groundhog sees its shadow today, winter will continue for another six weeks.
Guess what happens to winter if thousands do.
Yours meteorologically,
The Master
PS: The answer is "nothing happens to winter" because orbital paths and weather systems don't work that way, you primitive ignoramuses. If you guessed "we all die of the complementary blood diseases rabid genetically-engineered groundhog packs bring" you may award yourself a little gold star. It will look nice on your medical records and/or gravestones.