What I mean when I say "there is no line" is that there is no topic that one couldn't try to make funny. I've heard funny jokes about pretty much every subject - AIDS, rape, pedophilia, cancer, handicaps, dead troops, genocide (and a host of others). The only thing is, you risk coming off like a completely insensitive asshole if it doesn't work, but it can work.
and who does not like dead baby jokes
what is bad? 100 dead baby's in a trash can
what is rely bad? one alive at the bottom
what is worse? he has to eat his way to freedom
what is worst? he comes back for more