== Scope and merger == 
 Here's what I just wrote in the DYK review: 

 I am not sure that the article has a solid foundation. The basic idea seems to be to equate the boomerang effect with reactance (psychology) but that would make it a redundant content fork. But if you look at the history of the article, one finds that it started as a general account of boomerang effects, i.e. when an action backfires and is counterproductive. This is surely the general meaning of the phrase and we even have the concept on Wikipedia - see WP:BOOMERANG. 

 The article states that "Hovland, Janis and Kelly first recorded and named boomerang effect in 1953." but this strong claim is supported only by a citation of their own paper and that's not good enough. I find that Robert K. Merton identified multiple types of boomerang effect in his study of WW2 propaganda in 1949 - see Media And Audiences. That sociologist seems prominent in the study of such unintended consequences and it might be best for this article to be folded into that one again.