Dry Trap Cactus
Often the start of a chain reaction of needle explosions
This small, round cactus, is absolutely covered in thick, sharp needles. When disturbed, this cactus will vibrate for a second or two, then fire out its needles violently in a 15' burst. The needles of another Dry Trap Cactus are often more than enough force to trigger the next cactus to fire its needles as well. If someone manages to cut into the cactus safely, they'll find a dry, sponge-like material on the inside, not suitable for any form of consumption.