A cat’s gray matter shares some remarkable similarities to a human brain. Although experts disagree on the depth and range, all confirm that kitties feel emotions not that dissimilar from people. Happiness, excitability, playfulness, depression and anger. Any cat lover will agree — they’ve witnessed all that and more in their quadruped BFF. Watch out for that last emotion — an unhappy cat can leave you with a urine-soaked chair, shredded rolls of toilet paper strewn about or even broken dishes.