Lua

repeat
    wait(0.1)
    for i=0, 100 do
        script.Parent.Mesh.Scale=script.Parent.Mesh.Scale+Vector3.new(0, 0.01, 0)
        wait()
    end
    wait()
    for i=0, 100 do
        script.Parent.Mesh.Scale=script.Parent.Mesh.Scale-Vector3.new(0, 0.01, 0)
        wait()
    end
until false