Due to the Joker's familiarity with the Whip/chain, he can use it as a weapon +1 to damage or as a grappling device with the same effect as the 'Improved Grapple' feat: +4 bonus on grapple checks; no attack of opportunity, however, the Jester MUST tell the DM how he intends to use the weapon, the effect of a damaging attack cannot be combined with the grapple attack.  If a 'Joker' that has the 'Two Weapon Fighting' feat and a whip/chain in each hand, can use the effects of Damage or Grapple, but one one at a time per whip/chain, you cannot have two damaging grapple attacks, you can grapple twice, damage twice or one damage and one grapple, and the DM must be made of your intentions for each type of attack/s before the rolls. Restrictions for whips/chains that have added damaging effects such as spikes, razors, poisons, magical, ect., have their normal added effect during a grapple attack, but the (before enhancement) regular damage of the whip/chain is still unavailable.