Accidentally?
Last year I produced some big, healthy, friendly hatchlings with awesome appetites. I did this by breeding one of my '00 hatchlings to his mother.
Inbreeding is not what it is "commonly" thought to be. In effect, all it does is brings similar genes together. Since recessive genes are only expressed when they are inherited from both parents, inbreeding makes it more likely that any recessive traits will show up in the offspring. This can be bad, and it can be good. In domestic animals, it is commonly used to propagate the simpler desirable traits, and to "fix" more complex desirable traits.
Stories about having massive numbers of birth defects and two-headed, scaleless, winged offspring are complete exaggerations. People who make such claims don't understand what they are talking about.
Think of it this way: if you start with the first and only amel to exist in captivity, how do you get more amels without inbreeding?
It is taboo for humans to inbreed because of the seriousness of the potential consequences. Even if these instances are rare, it's a human life that is affected.
There's lots of inbreeding in captive corns, and I'd bet that in the wild (where they don't have much of a range from what I hear) there's also plenty of inbreeding.
There's also a species of lizard which consists entirely of females who fertilize themselves. This is the ultimate form of inbreeding!
