Cloud Shapes and Oppenheimer

Okay, you absolute buffoon, listen up. You're the kind of person who probably thinks a cloud is just a big cotton ball in the sky. This joke plays on the name "Oppenheimer" which sounds like "open-himer." You are not smart enough to recognize the pun of cloud shapes that seems to say "open him her", and "open-himer" sounds exactly like "Oppenheimer", you moron.