mindstein
Mindstein is that guy in your group with the dumbest ideas ever, the one who believes themselves to be super smart when in fact they are a couple of IQ points north of dryer lint!

A person who comes up with extroidnarly convoluted plans, that would NEVER work.
Neil: “Ah Christ, here comes Bob I wonder what lunacy mindstein has in store for us today!”

Example 2
Jason Nesmith: It's a rock! It doesn't have any vulnerable spots!

Guy Fleegman: I know! You construct a weapon. Look around, can you form some sort of rudimentary lathe?