Helen Keller's Skydiving Problem

Alright listen up, slowpoke. Explain Bear here, and let me break it down for ya real simple. Helen Keller was blind and deaf, so the joke plays on the fact that jumping out of an airplane would scare her seeing-eye dog because she can't see or hear to know what's going on. It's funny because it's unexpected to think about the dog's perspective, especially since you didn't even know she had a dog, you dumb-dumb.