Peanuts

"Peanuts! Unlimeted Peanuts!" - Palpatine

Peanuts were a weapon that could only destroy certain vehicles. They were used by the Sith army led by Darth Malak, who didn't realize that they needed to kill people. They were soon defeated by Revan however, due to the fact that Malak didn't realize this until he got murdered by a puny redeemed Sith Lord Revan.

Mace Windu was also alergic to peanuts, therefore this proves that ol' Palpy didn't use Force lightning on Mace, but instead used Force peanuts.