An unknown number of new George Washington dollar coins were mistakenly struck without their edge inscriptions, including "In God We Trust," and are fetching around $50 apiece online.
The US mint has been inscribing the phrase "In God We Trust" onto its currency since 1956, when Congress ordered it included as a counterpoint to the 'Atheist Communist Threat' (despite the fact that communism simply denounces all religion, as opposed to taking a hard-core anti-deist stance). As free thinkers, the Founding Fathers of the US would probably be rolling over in their graves if they found out that deist propaganda was being disseminated via the country's currency (and don't get me started on the fucking pledge of allegiance). To that effect, many atheist and anti-religious groups have lobbied and litigated (unsuccessfully, so far) to have this phrase removed from all US currency. Grass roots efforts to 'de-god' money have been around for some time. As an avowed atheist, and a staunch supporter of the separation of church and state, my preferred method is the red sharpie, as shown here.