They find the chest and Cap'n Jack, Will and Norrington fight for it. Norrington ends up with the heart and makes a run for it. The rest of the characters go back to the Pearl and are attacked by the Flying Dutchman. They outrun it but are caught by the Kraken. Cap'n Jack flees the ship in a rowboat. Will, Elizabeth and the rest of the crew hoist up a net filled withgunpowder intending to shoot it and set the Kraken on fire. Cap'n Jack comes back to the ship and shoots the powder (much to Elizabeth's surprise) setting the Kraken on fire, holding it off temporarily. They all agree that they should abandon ship. Elizabeth kisses Cap'n Jack which Will spots. She then cuffs him to the mast saying that it's him that endangers them. He gets killed by the Kraken. Beckett is given the heart by Norrington. The survivors of the Pearl go to Tia Dalma who asks if they want to save 'Witts Jack and his precious Pearl'. They agree. She then claims that they will need a Captain who knows where they are going. Down marches Captain Barbossa finishing the movie with the line 'So tell me what's become of my ship'? After the end credits, we see the dog that was left behind on the cannibal island sitting on the throne with a bone in his mouth. He has been made chief of the cannibal tribe.
Diogenes
Answer: The jar was to put Davy Jones heart in. He can't touch dirt ever again since he failed to keep up his duties which means he wouldn't be able to get his heart back.