Flow of the cards
This theory is so popular but makes no mathimatical difference what so ever. If the dealer makes a mistake and skips over somebody and they play out the hand than goes back to the person who wanted to hit and that persons ends up losing a lot of the time the floor person will be called over and the player will most likely get a push, if the person ends up winning they will get paid.
The other theory is the person at third base is responsible for what happens at the table good or bad. Which I think is a bunch of B.S.