After his harrowing experience serving SpongeBob and Patrick at Goofy Goober's Ice Cream Party Boat, Peanut Guy left his job so that he'd hopefully never have to see them again. It was difficult finding another job; Peanut Guy's specialty was dressing up as the establishment's titular food offering. When he discovered the Weenie Hut franchise, Weenie Guy, as he was now known, couldn't be happier. But little did he know, he hadn't seen the last of SpongeBob ... *
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If we're going by the "movie is at the end" timeline, this also works the other way around. Weenie Guy has a terrible experience with SpongeBob so quits and becomes a Peanut Waiter instead.