For added comedy value, have the enchanter hypnotise an enemy marked by a Battlemind. In my game this happened to an elite ogre, who proceeded to hit himself for 3d10+8 damage, knock himself prone, then took all of that damage over again as psychic damage from the Battlemind.
The comedy level here is much higher as the Battlemind never actually strikes the guy. He is just left standing there wondering, WTH just happened to that ogre?
<edit> The most powerful thing about hypnotism is having a creative player behind it, especially one with the gift of the gab. In one game, we tracked down a traitor to the crown and his nefarious master. The enchanter said something like "Well done Sir Traitorguy, you have served your king well. We would never have found the villian behind this plot without you. Now, cast off your guise of treachery and strike down this pretender to the throne..." with a decent bluff roll and the enemy not knowing that the PC is an enchanter, it suddenly completely changs the encounter.
The traitor is compelled to attack his own villianous master and the villian is therefore convinced that he has been double-crossed by the 'traitor'. This becomes especially funny, as now the traitor is in a lose-lose situation, finding himself friendless. He decides to hedge his bets and pretend that he really was a double-agent this entire time, sideing with the PCs.