Anything that can apply measurable resistance to the stick im attempting to skewer it with. That is too big. Only on two occasions has this happened. one was a pet tarantula I was playing with (not attempting to kill), the other was one I had found crawling on the backside (literally just on the wall in the open not trying to hide or anything) of my house, it had the proportions of this [url=http://www.idph.state.il.us/envhealth/images/pcspiders_clip_image026.jpg]brown recluse[/url], but upon impalement measured almost 6 inches from leg tip to leg tip. :( too freaking big man.