The 'Cade

"The 'Cade" is a sidequest of Episode 5: Spaced Out.

How to start the sidequest
Talk with Student next to the tables in Charles Cheezer to start the quest. 

Walkthrough
"Student is the current world record holder for skee ball. He's gloating about his success and has, in essence, challenged you to beat his high score."

Objective: Get a skee ball high score.
Go all the way to the left, activate the Skee ball arcade game and keep playing until you beat the high score. 

Objective: Return to Student.
Talk with Student again to complete the quest. You will be awarded with 300 XP.