"If You Can Hear Me...."

When the kid are getting rowdy say "If you can hear me, _________"....

Ideas for the blank are, touch your knees, wiggle your head, reach up high, stomp your feet, touch your nose. Repeat this with a few different actions. Talk in a normal voice. Do not raise your voice. Get quieter each time you speak, until you're whispering. Not everyone will do it right away. A few more will, then a few more, then a few more until you have everyone's attention. End on "If you can hear me, touch your elbows"- then you have them in a reverent position ready to listen.