Most people sing when they’re happy and animals are no exception. The big exception is that cats usually don’t sing along to songs written for humans, yet the cat in this video cheerfully accompanies its owner singing “If You’re Happy And You Know It” in Portuguese.
If your cat can do a simple trick like sing along, then it can be an Internet star as well. The sad thing is that cats can get more famous than many people for doing trivial activities. Then gain, many people get paid for doing trivial activities and cats never et paid, so at least we’re even.