I've posted some of these scans before but I've decided this issue needs more focus. I mean, it has Batman & Nightwing bare-chested! At the same time! *squee*! That doesn't happen a lot you know.
Batman, Nightwing & Robin do battle with the forces of Ra's Al Ghul. And since it is a Demon's Head story, the shirts come off! But this time, Ra's isn't the one who strips them. Batman uses his shirt to plug up a hole so he and Tim can escape watery death while Nightwing looses his while climbing up a cliff. By the time they face Ra's, their already ready for the requisite shirtless fight. These scans are from the milestone issue that is Detective Comics #700.
Obligatory gratuitous Nightwing ass shot!