If I saw a bunch of people pile out of vehicles and sneak around my house, it might not end with singing.
How about this. How about putting aside the machismo for just one day.
We used to occasionally have carolers come to our door, and on a least one occasion, I was part of a group that went caroling. However, that was back in the 1960’s—a long time ago and culturally, a galaxy far, far, far away.
You might want to search out the one on You Tube which has the Marine Corps Band and Choir flash mobbing in Grand Central Station (I think) .... much less frightening!