Although I'd heard of this amazing fan film trailer, I'd never bothered to seek it out, and here it was on Youtube.
I love it. For fans of Robin the Boy Wonder, "Grayson" (2004) is an alternate, Batman-less future, where Dick Grayson decides to come out of retirement, threatening his happy family life with Barbara Gordon (Batgirl). The costuming and makeups are excellent. Some fun cameos by various DC Comics' heroes and villains. It is written and directed by a guy named John Fiorella, who also stars in the trailer as Dick Grayson and Robin.