Note: this post is from 2007, outbound links may be broken.
Frog cleans stomach by ejecting it
After a disagreeable meal, a frog can empty its stomach by ejecting the entire organ inside-out through its mouth and washing it with its front legs before swallowing it back down.
Frog throws up his own stomach
The host of the show explains that a frog throws up in much the same way that humans do, but its stomach pops out because of its relatively wide and soft esophagus. Incidentally, some people believe frogs are right-handed because the ejected stomach protrudes to the right and they mainly use their right front leg to wash it.