The stupid light article in OregonMouse's post is excellent.

There may also be stupid heavy. For instance, carrying a couple liters of water when there is plenty of water available. Recently, I saw two waterlogged pillows and a frying pan discarded on the side of a trail.

Perhaps there is stupid far, too. Many newer hikers overestimate how far they can go and trade miles for enjoyment.

Perhaps someone could start a stupid thread.