Better than an actual dog.
I got myself a dog for self defense, but she's just too friendly. All she does when she meets a stranger is wag her tail and roll over for belly rubs. Basically, unless I get attacked by a giant vacuum cleaner, this dog is useless for my defense. So now when I'm out on late-night dog walks, I carry this flashlight. While the assailant is distracted by my dog's adorable puppy-dog face, I'll be able to take him out with the stun gun so we can escape safely. Unless the assailant has treats. In that case, we're both in big trouble.