First there was "icing" then "planking" and several other internet challenges that may or may not have hit full viral wave. The new one is the "Floor is Lava Challenge".
The concept is when someone yells "The floor is lav", you've got 5 seconds to find somewhere to get off the ground.
Don't mind me if you see me in Target or Home Depot doing this to my wife! My guess is she won't play along though haha!