You also might want to check out Murder Party (2007). That wasn't quite as successful as the other two for me--I only gave it a 7/10, but it's in the same vein. Think of something with the tone of Botched and Otis, but as a low-budget indie film (in other words, it has that "indie" tone, dialogue, lots of "film geek references", etc.), and you've got Murder Party.
Anyone seen Fido with Billy Connolly as a zombie being used as the family pet? Unexpectedly entertaining as was Botched and Otis, haven't seen Murder Party though.