Did you know that Jed Whedon, Nathan Fillion and Neil Patrick Harris sang a ballad about Ninja Ropes Extreme game? Looks unbelievable but it is true. I am a die-hard Firefly fan - so you can imagine what a suprise that was for me. The song is an absolute masterpiece.
Ninja Ropes ballad is a part of the musical commentary, an extra material available on the Dr. Horrible's Sing-Along Blog DVD release.
If you want to see it (and I think you must see it), get the DVD on Amazon, it's worth buying.
Thanks, Horrible team and especially Nathan Fillion (your costume on LA screening was really great). I'm in history now because of you. :)
Author of Ninja Ropes and Ninja Ropes Extreme.