A correlated football parlay would be huge dog and the under, or a huge favorite to the over. The premise being that if the huge dog covers, there will not be enough points scored, and if the favorite covers, there will be enough points scored to push the total over. In baseball,normally you would take the dog to the under and the fav to the over. There are no sports books that I know of that will let you parlay the runline to the total of the same game
This wager was and is being used instead of scalping baseball