My phone is in my pocket. I'm talking with a friend(s). I say "Let's take a selfie", then I say my Moto Voice catchphrase, "Obey me Droid Turbo". Then I say, "Take a selfie."
I then reach into my pocket, and in one smooth motion pull the phone out, hold it in front of us with screen facing us and the picture is taken. Always makes an impression. Must be done in a relatively quiet room. You might want to practice the timing. You have about 4 seconds from the time you say "Take a selfie" until the shutter snaps.