A good rule for roasting is that the better you know someone, the easier it is to roast them. Because when you know someone's weaknesses, you can really dig the knife in where it hurts the most. This is why there's nothing funnier or more savage than a really good self-own. Just don't take it too far or you risk burning a bridge with the idiot you have to spend 24-hours a day with for the rest of your life.
Here are 31 of the funniest, most savage examples: