**Edit: TL;DR:**
To get the Disciplined Badge, you need to delete an answer which is not accepted with 3 or higher score, then undelete it a minute later. You will not lose any reputation this way and earn a free bronze badge, since it is legal and known, I advise everybody to do this.

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**Edit:**
I changed my mind. This was a bad idea. 
At least I learned something. 

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***Disciplined Badge*** : Deleted own post with score of 3 or higher.
http://stackoverflow.com/help/badges/37/disciplined

I don't see how this badge affects the community in a positive way, it might be doing more harm to the community than good. 

Even if this badge is moderated for abuse, it wastes the time of moderators for a useless reason: "Some guy deleted a good answer for this stupid bronze badge"

( Negative effects of this badge / Positive effects of this badge )   
Is definitely over 1 and I think it should be deleted or stop from being earned anymore.