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This article contains details of the ending and/or a surprise plot element.
I Dated a Robot (S03E15)
One of the Liubots gets stuck to a fire hydrant and fills up with water until she bursts.
Later on, the gang's attempt to stop the remaining Liubots is thwarted when they swallow the popcorn seeds. Fry's Liubot saves the day by aiming the movie projector at the Liubots making them filled with popcorn before they explode.
Anthology of Interest II (S04E08)
In the first segment, I, Meatbag, Bender experiences life as a human after testing Professor Farnsworth's new reverse fossilization machine, which can turn metal robots into flesh-and-blood life forms, and eventually gains over a thousand pounds.
Teenage Mutant Leela's Hurdles (S04E09)
The gang try to make Professor Farnsworth younger by using age-reducing tar, but an accident happens and they all end up covered in it. The tar changes their bodies to exactly match how they looked when they were younger; because of this, Amy is fat again.
The Sting (S04E12)
In one of Leela's dream sequences, Amy and Hermes are seen wearing roller skating attire then are stung by bees. This causes both of the to inflate in the process.
Three Hundred Big Boys (S04E16)
Farnsworth's girlfriend April removes her special treatment and reveals to be fat when he reveals to be old.
The Prisoner of Benda (S06E10)
Farnsworth wants to get into a good shape seeing a photograph of Amy's fat junior self, so they switch bodies so that Farnsworth feels youthful and Amy can help him gain a belly.
When Bender steals her body, Amy uses Leela's body to get a discount at the theater and digest her food but also pig out on all the high-calorie foods she usually denies herself, fattening up until, according to Hermes, she "makes Fat Albert look like Regular Albert." Amy agrees to take Hermes' body so he can lose Leela's weight.
Meanwhile, Farnsworth bloats up briefly in Bender's body when he swallows a bomb at the circus.
Saturday Morning Fun Pit (S07E19)
A girl in a commercial for Purpleberry Puffs gets affected by the high-calorie cereal.
Bender Drinks a lot of beer making him bloat.
Viva Vi Mars
In a heist to steal money from the Robot Mafia, Amy orders an invisable Zoidberg to eat a metal case and 300 pounds of cash.
In one of the stories, a bird version of Amy gets eaten by a snake.
Into the Wild Green Yonder
Trading Spaces (#72, 2014)
After Leela saves the Nimbus from a black hole, President Nixon fires Zapp Branigan and puts Leela in charge of the Nimbus. After a week of being in charge the power goes to Leelas head and she starts sending the crew of the Nimbu on dangerous (suicide) missions while she sits in the command chair eating nachos and pizzas. After a few more weeks she has gained a bit of weight and has pretty much turned into Zapp.