Halloween "Couples" Costume

My little boy will be 4 months come Halloween and though I'm not going to take him out trick or treating, I want to dress him up (oh the adorable photos!) we have a lot of kids in our neighborhood and I was planning on passing out the candy. I need ideas for a "couples" costume for me and my son! A few I've considered:

Mommy whale and baby barnacle

Mom and baby monkey

Mommy behive and baby bee

Mommy Cookie Monster and baby cookie or Elmo

Drop your ideas, I've got to start planning!

Pic of baby Dresden for attention