Supernatural, TV series?

Good questions. The first time the *****/jerk thing is done is in the Pilot. Then again in Born Under a Bad Sign and then Dean tries it in What Is and What Should Never Be, but it doesn't work because Sam doens't remember. I don't remember them doing it after that. Sammy's are getting fewer and further between. The last time I can specifically remember Dean calling him that is in My Bloody Valentine, but that doesn't mean it was the last time.