A little nip action can go a long way...
http://68.media.tumblr.com/3e8017b470089e968e33a386237fd105/tumblr_okdqb6ODmZ1tpk1azo1_400.gif
http://68.media.tumblr.com/6ab46af91281f4a87bae4ea8da674eb6/tumblr_nxw5rn99Tk1sz89axo1_500.gif
However, some need something a bit more aggressive...
http://68.media.tumblr.com/3052a5ce537ce2d23da3c0deeb8bcdfe/tumblr_nupfs64y0K1rop7gno1_500.jpg
http://68.media.tumblr.com/0c52dd8e5d75447cd09fc8a257fa5792/tumblr_ol0rpdrJKv1uoff1vo1_1280.jpg