Both helium and ferret ointment are known to have this effect on The Cheat.
Homestar: Woah, Marzipan, check out that ugly bird.
Marzipan: Homestar, I think that bird is the Cheat.
Homestar: No way! The Cheat is one fine-looking young man. That is an ugly bird.
There are animated banner ads out there that advertise ways to trim inches off your belly. Because most of these ads are poorly animated, their portrayal of a person losing weight typically consists of an otherwise skinny person with a large belly "deflating" so to speak, rather than having realistic body proportions for their before and after weights.