Waysoftheearth's Wyrmspear PBP
Mere mortal men working on a building project. Not sure it's profoundly stupid of them to handily avoid certain death at the hands of the players... we'll see.
OD&D does tend toward dramatic/obvious spell casting, requiring at least an un-interrupted period of concentration to execute. However, the exact art of it is up to your imagination. As long as you fit it within the game parameters, you can describe it however you like.