its a 2008 episode when Squidward has to go back to Boating school and is forced to sit next to Spongebob. Then Squidward draws a diagram of why he had to comeback to boating school. And then Spongebob comes to the board and draws this diagram with this intense violin playing in the background. Then the diagram simply says, "Squidward and Spongebob, BEST FRIENDS FOREVER!"