What happens if an anaconda changes his mind when he just had lunch? Yep: a whole cow comes out. This video shows a Brazilian anaconda puking out or regurgitating an entire cow. The big snakes have been known to do this. When they’re frightened, for example, to be able to move quicker. In this newly shot case the reason for the vomiting is unknown. There’s also some debate about whether the spotted animal actually is a cow, a goat or a capybara.