Cat's have a number of directives that they follow. When it comes to vomit, they need to have at least two of the following to meet their objectives: 1 - It must be behind the heaviest piece of furniture.
2 - It must be hidden.
3 - It must cover the largest possible area, preferably landing on as many surfaces as possible.
4 - It must be on carpet.
5 - It must be in a spot that ensures a human will step in it while walking around in the middle of the night without glasses on.