The hero you deserve
As per the AD&D NPC class from Dragon #60, and revised several times up until 3E. It's always good for a laugh!
I think right here is the best ability made for a potential Jester sub-class. The thrown-weapon combat style is underplayed in the game right now, but letting someone get one additional attack with light / finesse / thrown weapons does not break the damage bank, and gives things like darts a foothold back in the game that they are currently missing. A Bard getting to throw three d4 damage darts per round (using TWF) would give those weapons back some heft. (The only potential concern would be the handaxe, as its the only light / finesse thrown weapon that is 1d6 rather than 1d4 and thus damage-wise might be a little too high with three attacks at level 1.)Master Juggler
At 6th level, you have become so accomplished at juggling and manipulating objects that you can put your skills to use in combat in two ways.
First, if you have multiple light, thrown weapons, you may juggle them during combat. If you take the Attack action while juggling, you can attack twice, instead of once. You must have both hands free to juggle. You may safely juggle a number of weapons equal to your Proficiency bonus during combat.
Quicker version.Befuddling Verbosity
Also at 3rd level, you learn to change the speed and cadence of your speech such that you can talk others into strange knots. When trying to influence someone, you may spend one of your uses of Bardic Inspiration, rolling a Bardic Inspiration die and adding the number to either a Charisma (Deception) or Charisma (Persuasion) roll. You must still be able to communicate with the target normally. If you are attempting to sway multiple individuals, the bonus applies against all, if they are all part of the same "audience". This technique is known to offend some people; anyone so swayed is permitted a Wisdom (Intuition) check, an hour after your interaction. The DC is equal to 8 + your Charisma modifier + your proficiency bonus. If they succeed, they realize that they were bamboozled by your browbeating and may be less friendly the next time you encounter them. This check is permitted whether or not the bonus from the Bardic Inspiration die made a difference in your success.