Robin Williams was one of the most funny people on the earth. He made people laugh. But his tragic death made everyone cry. HBO is making a documentary about Robin Williams, who took his own life in August 2014. The documentary has a very interesting title-- Robin Williams Come Inside my Mind . And on Thursday HBO released the trailer for the documentary. The trailer is very emotional. It brings back our memories about the actor. The first trailer shows Robin Williams' various performances on stage. We can also see many other eminent people commenting about the great entertainer. Comedy legend Steve Martin says about Robin Williams, "On stage he was the master...". "Off-stage, I just felt he was holding himself together," Martin adds. There is Williams' own voice: "Every person is driven by some de--(stammering)..Deep secret." Eric Idle says: "He made all people laugh and laugh and laugh." The trailer touches the pers...