Charged surfaces submerged in an electrolyte solution can sometimes become oppositely charged. This nonintuitive phenomenon, known as charge inversion, happens when excess counter ions adsorb, or adhere, to the surface. It can occur in a number of chemical and biological settings. In certain situations, theory predicts that a highly charged surface not only changes sign, but can become more highly charged than the original surface. This is known as giant charge reversal, but remains controversial and has never been observed experimentally.