When Tall Girl gets a boyfriend, Tall Boy, everyone loves him except Jason, who goes to every means possible to get rid of the new kid; When a good day turns into a bad one, Jason calls out Mother Nature for unfair treatment.
It's Tim's birthday and his one request is no birthday party, but tone-deaf Jason takes this to mean the opposite; Jason lands himself and Ronnie the assignment of having to babysit Pregnant Lady and Pregnant Dad's newest baby.
Jason and Ronnie take advantage of Linda being away and turn Jason's home into a hotel; Tim reminds Jason 'time flies when you're having fun,' so Jason and Ronnie attempt to stop having fun in order to prevent summer from ending.
When Jason loses Tall Girl's yearbook, Ronnie is determined to help find it while juggling his ambitious to-do list; Jason's attempt at a new style leads to a bad haircut. His quest to deal with it spirals out of control.