I started my Ludum Dare 33 competition entry with the theme of "You Are the Monster".

The evil Dr Destructo's nefarious plan has just been defeated by the forces of good and he is in a foul temper. He is sure that his plan was sound and the reason he lost was due to incompetence by his minions. He has summoned his loyal monster to use its powers of mind reading to discover who is responsible for the defeat and deal out horrible retribution!

Seriously though, if you wanted to help me out, I need some ideas for funny reasons that this unspecified plans could fail. Things like "Minion was drunk", "The meal before the attack, the minion cook used spoiled food to make dinner, so everyone was sick" and "minion forgot to put bullets in his gun" are what I'm looking for.