Harpoon gun

From ''The Lemony Snicket Wiki''

In The Penultimate Peril, the harpoon gun is described as 'a large, wicked-looking object, with a bright red trigger and four long, sharp hooks.' Used previously by Esme Squalor at the Village of Fowl Devotees to shoot down a crow and to damage the rope ladder of the self-sustaining hot air mobile home, and then was used by Klaus, Sunny, and Violet Baudelaire to accidentally kill Dewey Denouement when they dropped the harpoon gun on the floor, it went off, and a hook struck Dewey in the stomach.