11. If You Don't Have Anything Nice To Say Then Keep It Zipped
Being deliberately nasty to someone for no reason whatsoever other than you can, is called bullying and it should never be tolerated. It doesn't matter how much weight Phil has put on, you don't go up to them and say "hey Phil, you're looking a bit tubby today. Was it maybe someone you ate?" Just don't do it; it doesn't resolve anything and it most certainly isn't going to be a peaceful way to live your life as Phil will probably retaliate or say nothing at all so you'll never know how much damage your mean comment has actually made.