no idea whats wrong with this trigger

[mj1994]

• Events
  • Unit - A unit Acquires an item
• Conditions
  • (Item-class of (Item being manipulated)) Equal to Miscellaneous
• Actions
  • Set Item_Head_Misc[(Player number of (Owner of (Triggering unit)))] = True
  • Special Effect - Create a special effect at (Position of (Triggering unit)) using Abilities\Spells\Human\ThunderClap\ThunderClapCaster.mdl

The special effect is there just as a tester.
but NOTHING whatsoever happens need help please....

It looks fine to me and I'm a little ashamed that I screwed up a trigger this easy.