In the following video, Motley Fool analyst John Reeves gives us his weekly wrap-up, discussing three companies that cratered this week. He tells us how Herbalife (NYSE:HLF) took a big hit after one analyst came out and called it a pyramid scheme, tells us why Markel (NYSE:MKL) fell after announcing it would be buying Alterra Capital (NASDAQ:ALTE), and discusses Research In Motion (NASDAQ:RIMM), which had been back on the rise, but fell this week after news from its conference call, saying that the company's vital service revenue may come into question next year.

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.