Who took the sword from Napoleon at Waterloo?

Nobody.  When he realized he lost the battle, Napoleon went back to Paris, where he realized he lost his political support.  As he became a "wanted man" his intention was to sail to North America.  He made it to the Île-d'Aix in the Bay of Biscay but found his passage blocked by British ships.  He finally surrendered to Captain Frederick Maitland of the HMS Bellerophon on July 15, 1815, 27 days after the Battle of Waterloo.

Sooty from the Sooty and Sweep show.

He said to Napoleon "squeak squeak squeak squeak squeak" and Napoleon shat himself.  

I don't know, but I'll bet ol' Nappy never bought him dinner.

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Update: C'MON!!! That was funny!!!

Pierre. Private Pierre Le Smith. He was the soldier who dropped his sword while marching past Napoleon's tent. Napoleon, who'd just got up from his hammock, saw the sword and rushed over to pick it up (he was going to add it to his "found swords" collection, apparently). Pierre, who wasn't too bright and didn't know it was his Emperor, punched Napoleon and took his sword back. Hope this helped.

Sgt Major Bob Scoggins of the 69th Foot and Mouth [Kings Division]. Actually, that's not true sorry.