>>104210146He ordered a drink that he never got because Mr. Krabs hung up the phone too early.
For a long time, I thought that fish never actually ordered a drink and was just being an entitled asshole, but then I read a theory that he did order one but Mr. Krabs didn't hear it because he hung up the phone while the fish was still talking. The more I thought about it, the more it made sense. If he never really ordered a drink, then why would he get so pissed off over not getting one when he knows full well that he never ordered it?