Parseltoungue

"parseltoungue" is snake language. Only very few could speak it, and they were all in SLytherin, for it was Slalazar Slytherin's gift. Only one person that wasn't in Slytherin could speak it. That is Harry James Potter himself. When the Killing curse backfired the night Voldemort tried to kill him, he transfered some of his powers to Harry, and that was one of them. When the Chamber of Secrets was opened, Hogwarts found that Harry could speak parseltoungue, and most of the school thoght he opened the Chamber, but actually a diary containing a bit of Voldemort's soul controlled Ginny Weasley into opening the Chamber.