Ah well, then... I believe it finally be time fer yer next pirate fact, mateys! I thank ye kindly fer requestin' 'em.
First off, SusieJane's request fer inf'rmation regardin' that "P" brand what Jack Sparrow has upon his arm in POTC. Well, I have done me a fair bit o' searchin' upon the int'rnet and have met with little success. Howe'er, I did come upon one other forum where such a thing were discussed and what I read thar made a good bit o' sense when compar'd te some o' the piratical readin' I been doin'. And so, it would seem that such a "P" brand, meaning o' course, "Pirate", given te Jack by the British East-India Trading Company (as mention'd by Commodore Norrington hisself), might o' been somethin' that really happen'd back in those days. While we'd tend te think they'd be hangin' any captur'd pirate, it were the case sometimes that pirates be condemned te life as slaves in service te whate'er o' the British Trading Co's they brought damage te (as I have read some o' our Caribbean pirates were captured and sentenc'd te work as slaves fer the Royal African Company). Most would die at such service in a few short years. It were postulated upon this other forum, that such a "P" brand might o' been used in such cases, te differentiate the pirate slaves from any others. Aye, fer they'd likely be treated even more harshly than other slaves and would be havin' a close eye kept upon 'em fer fear they'd try te make an escape. And so, it would seem our Jack Sparrow were condemned te such slavery per'aps fer plunderin' ships o' the East-India Company, but managed te make his escape. Wily, that one, eh?
And now te depply's request. First off, let me tell ye that pirate ships were one o' the first places in history where the idea o' democracy took hold. Surprising, eh? Captains and other officers aboard ship were chosen by vote o' the whole crew, as were decisions o' where te sail and what te do with captur'd ships. Prob'ly we all thot it were the Capt'n what dictated te the crew what they'd be doin', but it were in fact a decision o' the whole. Plunder were also shared out accordin' te a plan set out in writin' and agreed te by all the crew b'fore e'er settin' te sail. A much fairer system o' workin' than ye might have suspected, eh? And so, here be some o' the officers o' a pirate ship, with a bit o' information on each o' 'em:
Capt'n - Had total power when the ship were engaged in fightin' and chasin' and such, but were te keep te the wishes o' the crew at all other times.
Quartermaster - Sort o' the crew's repres'ntative on board. Settl'd disputes among the crew, including givin' out certain punishm'nt when needed. Led the boardin' party when takin' o'er other ships and often were given command o' captured ships.
Boatswain (or Bo'sun) - In charge o' all the riggin' and such aboard the ship. Kept the crew te workin' the sails and gear prop'rly.
Gunner - In charge o' all the guns aboard the ship, includin' cannons and swivel guns and such.
Carpenter - As the name suggests, kept the ship in top shape. Extremely import'nt te the welfare o' all others aboard. Without a carpenter, ye'd have none what could prop'rly repair the ship after battles and when takin' on water.
Cook - Self-explanat'ry, I suppose.
First Mate - Far as I can tell, made sure all the Capt'ns orders were put into place and all crew knew what te do. Kept track o' the stores o' the ship (such as plundered goods, food and such). The Captn's right-hand, as it were.
Second Mate - Tho an officer, worked more closely with the crew. Did all what the first mate asked o' 'em.
B'sides bein' elected te position by the crew, a pirate were free te turn down the position offered, tho it'd prob'ly not sit too well with the rest if he did so. This subject brings me te yet another idea fer a pirate fact, mateys. That bein' the ship's articles. I shall cull together me fact and have it for ye sometime soon. Hope ye find this one te be o' use te ye.
Ah, but I must take me leave fer a bit... Barbossa be awaitin' me fer a loverly walk in the moonlite... underwater! 
and 100s of people come to my neighborhood
