Oh, I already do this one all of the time.
In fact, one of my favorite pastimes is walking into the middle of a conversation, turning to the person who last spoke, and just yelling at him "How Dare You!"
It's quite a bit of fun, and I find that most of the time people say things where such a statement is actually quite applicable. It's always great when I accidentally catch someone saying something controversial, they immediately start guiltily and try to defend themselves.
RE: "Yell 'How dare you!' in the most ordinary everyday life moments."