F.U.N.

SpongeBob is convinced that Plankton's so evil because he's lonely and needs friends. to prove it,spongebob befriends Plankton and the two start spending time together.

F stands for friendship, U stands for u and me(which stands for you), N stands for nything, (which the n stands for an). Plankton's version is F is for fire, U is for uranium bombs, N is for no survival.