What could go wrong with a handheld battery-powered device that spins sharp blades rapidly to make smoothies in a society that demands immediate satisfaction? Well, unshockingly, a lot, which is why BlendJet is recalling nearly five million units of their portable blender for defects that can cause a fire and fling the sharp blades, the Associated Press reports. The company is recalling 4.8 million BlendJet 2 Portable Blenders after more than 300 incidents that have led to burns, cuts and other injuries to users.