This is a SpongeKid SlightPants: Lunch Hour episode.
SpongeBob and Sandy fight over who gets one of Patrick's Oreo cookies.
(Patrick is eating an Oreo cookie. Sandy walks in)
Sandy: Hey, Patrick.(Patrick waves back) Can I have an Oreo?(Patrick shrugs) WHAT??!! But I want it NOW!!!(SpongeBob walks in)
SpongeBob: 'Sup, Patrick? Hey, can I have an Oreo?(Sandy goes red-hot)
Sandy: I ASKED HIM FIRST!!! GRAAAUGH!!!(rips SpongeBob to shreds until he is no longer visible) Now, Patrick. GIVE. ME. A. COOKIE. NOW.
Patrick: Sorry, they're all gone.(Sandy looks at the screen, one eye half-closed.)