Some Nick shows at times I think may have been sad like SpongeBob Where's Gary and the Movie, but I don't think I've ever cried at a NickToon...you know...shedding tears!
Actually there was one exception, but it was an Animated Show on Disney Channel called The American Dragon: Jake Long and I think it was also a finale Special for Season one or something like that, it was the one where Jake and his pals try to stop the huntsmen from getting those Aztec Skulls, and he finds out his Girl Friend (the blonde) I forget what her name was is part of the huntsmen and in the end Jake had to wish for some sacrifices. That was the only one I could think of and remember that I actually shed tears, they really did a good job of making that the saddest Special ever...though was still good!