This is a SpongeKid SlightPants: Lunch Hour episode.
SpongeBob sees Sandy's new pink coat and makes a complete fool of himself.
(SpongeBob comes across Sandy)
Sandy: Howdy, SpongeBob.
SpongeBob: So, yeah, I talked to-(sees Sandy's new coat, and goes motionless.)
Sandy: You okay, SpongeBob?
Sandy: What about it?
SpongeBob: ...it's...it's...(Patrick comes and knocks SpongeBob over. Sandy is shocked)