I'm not sure if it would be considered stupid, but the best example I know off hand, is the death of Pyrrhus of Epirus. He died in the city of Argos in 272BCE.

A great Tactician, he lost an Assault on the city of Sparta, and on his withdraw saw opportunity to intervene in the affairs of Argos. This proved a rather rash decision for Pyrrhus, and also an unusual one, in my opinion. With the fighting raging in the city, he was involved in a scuffle himself (from horseback), on the crowded city streets; when old woman dropped/threw a tile or pottery at him from a nearby roof or window, knocking him from his horse, and either killing him outright, or paralyzing/knocking him out; after which he was promptly beheaded by the man he was fighting.

I personally find it rather stupid, as the entire engagement was a brash decision he shouldn't have made. But he was a man of brash decisions. His entire career was a series of wishy-washy decisions.

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Anne Frank, what a stupid death for her indeed.

Also, Alan Turing if the movie was accurate. Such a shame.

Edit: I'm trying to figure out how a great young mind like Anne being gassed by Nazis doesn't meet the titles criteria.