The Babbling Curse, which incantation is unknown, was a curse that caused a person to babble uncontrollably.
According to Gilderoy Lockhart, he once cured a Transylvanian farmer of this affliction, which would have been an achievement for which he stole the credit from a more accomplished witch or wizard.

Hi, my witches, wizards and muggles, this was the chapter for today!
I wish you alle a nice weekend and hope we'll read us again next week!