sentences:  William Shatner was a presenter at Lucas' American Film Institute Lifetime Achievement Award ceremony in 2007 and did a comical stage performance honoring Lucas.In 2015 at a live concert, Shatner dressed as an imperial stormtrooper singing "Girl Crush" alongside Carrie Underwood and Brad Paisley.In 2011, Shatner and Carrie Fisher posted a series of humorous YouTube videos satirizing each other's franchises.