Balloon Belly/Film

Templeton in the animated Charlotte's Web, during a musical number. The more recent version was more realistic and didn't have him expand so quickly.
A literal case was shown in The Master of Disguise. One of Pistachio's disguises while being trained by his grandfather was an inflating "fat businessman" suit. Unfortunately, Pistachio tugged on the cord too hard and, well, guess what happens next.
Strange Brew. Comes in handy for firefighting too--

Bob: Jeez, I gotta take a leak so bad I can taste it!

Violet Beauregarde brings this to life in the adaptations of Charlie and the Chocolate Factory
- It's not so much from stuffing herself as it is from a problem with the final part of the seven-course-meal gum. The blueberry pie part quite literally causes the unfortunate victim to become a blueberry in shape. The gum itself, however, is the size of a regular piece of gum. There's a reason why Wonka hadn't released that to the public yet.
Timon and Simba at the end of the bug eating contest in The Lion King 1½.
A particularly memorable example is the Mr. Creosote sketch in Monty Python's The Meaning of Life. You'll be the one needing a bucket if you try to watch it whilst eating.
In The Naked Gun 2 1/2, Drebin incapacitates evil minion Savage by putting a fire hose in his mouth and flooding his stomach. When Drebin attempts to cut the water, he breaks the valve. Savage blows.
Mr Big's demise in the James Bond film Live and Let Die. Serious Narm.
Men in Black II, following this scene:

Creepy: Hey, pretty lady. [licks her] You taste good.
Serleena: [eats him whole] Yeah, you too.

Big Trouble in Little China. Thunder when he inflates himself by massively inhaling.
A gluttony victim from Se7en was killed when John Doe forced him to eat a large amount of food, then kicked him in his severely distended stomach.
Happens to Christopher Lloyd in My Favorite Martian (TV) after clearing out an Ice Cream store.
Cool Hand Luke, after the Fifty Eggs Challenge. Mixed very oddly with a Crucified Hero Shot.
Eliot in Open Season, after accidentally inhaling a helium balloon during the convenience store scene.
In The Return of Hanuman, Maruti had a Balloon Belly after he ate the whole village food supply.