Jack also uses the name Smith when talking to those silly navy soldiers, Murtogg and Mullroy. Murtogg:"This dock is off limits to civilians." Jack:" I'm terribly sorry I didn't know, if I see one I shall inform you immediately." Jack then tries to get on board the Interceptor, but is blocked by the two. Jack:"Apparently there's some high-toned and fancy to-do down at the for, eh. How could it be that two upstanding gentlemen like yourselves did not merit an invitation." Murtogg:" Someone has to make sure this dock stays off-limits to civilians."
Then they start talking about how the Interceptor is faster than the Black Pearl and some other boring stuff. But during all this chit chat Jack sneaks on board but the to soldiers realize it and climb a board as well. Murtogg: "Eh! get away from there!" Mullroy:" You don't have permission to be aboard there, Mate." Jack:" I'm sorry it's just such a pretty boat. er, Ship." Murtogg:" What's your name?" Jack:"Smith. Or Smithy, if you like." And let's not forget when Jack later impersonates Judge Smith in Pirates of the Caribbean: On Stranger Tides, but that's a story for another time. So remember "I'm Captain Jack Sparrow" -Jack