what is the most brainfuck viral loop you have ever seen?

For example, I bought a Useartemis lifetime deal on Appsumo a month ago. When I arrived on the dashboard, he suggested that I double my credits with an Appsumo review, triple my credits with a G2 review and quadruple my credits with a Capterra review. Results = 472 reviews in 2 months for an early SaaS. Awesome!