Spongy Patty shown here
SpongyPatties were sponge-like patties that poisoned the customers and turned them yellow and spotted like SpongeBob. They were accidentally invented when Mr. Krabs wanted more room for SpongeBob-shaped ice cubes as part of the Krusty Sponge restaurant. He thought they looked like SpongeBob and told the new fry cook Squidward to fry them instead of the normal ones. When a Krusty Sponge customer ate one, he/she became yellow and had a stomach ache. Eventually, an agent caught Mr. Krabs, and he went to court. SpongyPatties were never sold again after that.
Looks
The patties are yellow and spotted, like SpongeBob. They are patties which have gone 'stale' and were poisonous to eat. This is what gave them their colour. It is unknown if the spots however are like Spongebob's, you are able to touch them and go through them.
Trivia
- Mr. Krabs said that the Spongy Patties were Krabby Patties that were left out for awhile. In the episode Born Again Krabs, another Krabby Patty was left out but it was old and crusty unlike the Spongy Patty.