There is a dark thoery that the ending was Sandy ascending into heaven, and that she really died when she almost drowned in the opening scene. And the whole movie was just her journey to the ascension. But the writers and the cast have said this is false.Slightly off topic... but what DOES the end of the movie Grease mean? They fly up into the air in a car???!!! What the frick?
Some believed the flying car scene at the end was Sandy and Danny flying off into the sky inside their red Grease Lightning hot rod chariot, signifying the dream/reality of making it to Mount Olympus as an immortal God or Goddess. But the creators debunked that as well and said everyone is over thinking the whole thing. They finally said the ending was nothing more, than to signify the two of them happily flying off into the sunset.