Raphael Satter (December 29, 2013). "Report: NSA intercepts laptop deliveries". Retrieved December 4, 2013 - via Twitter. The final time Stallone sang in a movie was in Grudge Match (2013) when he and Robert De Niro executed "The Star-Spangled Banner" together. A film depicting the history of Jack "Galveston Giant" Johnson, the to start with African-American boxing heavyweight champion, is in development.