From a report by Mr. Brad Matthews for the Washington Times:
Stanley Black & Decker has recalled 2.2 million DeWalt, Stanley, and Craftsman brand fiberglass sledgehammers due to the risk of the hammer head loosening and striking the user.
(Serious note: Before I deliver my punch lines and article links, I refer readers to the Consumer Product Safety Commission recall page for the sledgehammers (archived version). If you believe that your sledgehammer may be affected, I encourage you to consult the recall page for further guidance.)
My layman sledgehammer take is that sledgehammer heads are supposed to stay connected to the sledgehammer during use. Thus, I believe that sledgehammer heads loosening and striking the hammerer (or others within range of sledgehammer head projectiles) would be sub-optimal. However, I have no doubt that Justin of our Justin and Justina dialogue duo could find a way to spin it (perhaps literally based on the recall notice) much like he did in the case of reports of lead and cadmium in popular dark chocolate brands. I have not yet asked Justin whether news of Stanley Black & Decker’s unreliability has shaken him as much as when he learned that he cannot fully trust GLBSUNION and CUZMAK.