An intelligent gauntlet with massive ego and horrible Charisma that keeps forcing the wearer to smack themselves and keeps taunting its wearer to "Stop hittin' yerself! Stop hittin' yerself!" (not a sword, but still....)
An intelligent Falchion of Wounding that can't stand the sight of blood, screams like a sissy whenever it sees bleeding, and faints at the sight of gore, becoming unwieldable then and sticking to the wielder's hand.....
An intelligent Sword of Subtlety that shouts "BOO!" whenever the wielder tries to sneak attack someone, ruining the sneak attack but perhaps giving someone a heart attack in the process....
An intelligent Holy Avenger that holds the soul of a former lich who reformed and now will only fight to protect children, always demanding to anyone it encounters that they must also vow to protect the children, or else it'll threaten to smite them with all the unholy powers of death and unspeakable evil unless they swear that they would go to the 666th layer of the Abyss to protect the children.....
An intelligent Nine Lives Stealer that will only devour the souls of people named Bob, forcing the wielder to attack anyone named Bob, and always asks someone new if their name is Bob.....
An intelligent Mace of Terror that constantly yips like Xena whenever it is wielded.....
Intelligent Dancing Nunchakus that boogey and rap when unleashed.....