Board Thread:Tapped Out Help/@comment-173.240.24.197-20160213173204

What is the deal with the Smithers and Burns pictures on the cooling towers? I thought I read something about it but now I can't remember where. I see some people have their pictures on the cooling towers at the power plant but can't find where that came from. Any idea? Is it part of a quest or part of the Valentine's Day event or what?  