Enter the Cybrids.
Here's one for those who like their horror blended with science fiction.
Researchers are to create human-animal hybrid embryos. Basically, they take an animal's egg and replace its DNA with human DNA.
Now, what's that going to come out as? An animal that acts human, or a human with animal tendencies? We already have enough of the latter in real life, I think.
The DNA should make the embryo develop as a human but its mitochondria will be animal and so might some of its cell metabolism. So you might have a human who can run like a cheetah, or stay underwater like an otter.
The scientists have even given us a new name to play with. Cybrids.
I might have a go at this myself. It sounds a lot more fun than all that grafting.