I've never done that but I'd imagine it would make you feel really guilty afterwards. That's not a good feeling. Hate is just negative energy anyway. It festers inside you and wears down your soul. It's not good for you emotionally and it's not good for your body or your brain either. And it just makes you all bitter and miserable inside as long as you still hold onto it. That's why people who are hateful all the time are generally not happy people.