Don't start a sentence with, "Don't get mad, but..."
When you start a conversation with these four simple words, there's, like, a 99-percent chance the person you're talking to is going to get mad.
Sure, in some cases, it's unavoidable—like on NCIS when Fornell informed Gibbs that he blew out the electricity in his house while the two were having dinner. When there's no way around the conversation, just try to have it away from any easily flung food or potentially sharp objects.
Watch NCIS on Tuesdays at 8/7c on CBS and CBS All Access.