Easiest Evil Plans to Defeat
Barring any parodies/spoofs, what villains' nefarious plans would be or should have been the easiest to foil? Or what could the heroes have done differently that would have increased their chances of success much, much more?
I'll give an easy one: Pops sending Kyle Reese and Sarah Conner TO THE FUTURE in Terminator: Genisys instead of taking advantage of 20-30 year head start on Skynet.