Why Wasn't I Invited? (S02E05)

Pee-wee's flowers are really bothered by a caterpillar that has made its home in their flower box, but things change when Magic Screen reveals how a caterpillar transforms into a stunning butterfly. Meanwhile, Cowntess throws a birthday party and invites nearly everyone in Puppetland, leaving Pee-wee out of the fun. Is she upset with him, or is it just her mood swinging?