Emohawk - Polymorph II - S6-E4
Stupidity: On the walk back to Starbug, the Emohawk jumps on Lister's head to disguise itself as Lister's hat, but it leaves itself in its natural form whilst the crew continue to walk. The Emohawk is supposed to be disguising itself to fool the crew into making them think it is any everyday object. The Emohawk eventually changes into Lister's hat, but leaving itself in its natural form even for just a small amount of time could blow its cover. (00:18:15)
The Killer - S1-E1
Stupidity: To make the hit, The Killer places a bomb on the ceiling of his room - which is the floor of the victim's. He has absolutely no way to know where in the room the man will stand and when we see the explosion, it does not even touch the couch. The brilliant plan of the flawless killer is anything but brilliant or flawless.