Used something like this to jump start a lesson about using commas and it works great when you put it up on the smartboard to get them going!
love her lesson on how toothpaste words...students work as a team to squeeze out the toothpaste as fast as they can, and then as a team try to put the toothpaste back in the tube. start a classroom discussion about how words come easily out of your mouth, but you can't put them back.
Count to five or hold up one finger at a time when the class needs to refocus. Discuss what occurs for each number at the beginning of the school year and eventually the reaction will be automatic.