Repopulating the planet, Adam and Eve "zero", & incest.

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In dog breeding it's usually father-daughter...

Don't know if this would be best for humans or not.

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It doesn't work for dogs. This is why most purebred dogs are riddled with genetic defects. Inbreeding is good for winning ribbons in conformation shows. If you get a dog that is close to the breed standard. You can easily produce more dogs that are close to the breed standard by inbreeding (dog people prefer to call it linebreeding). It is not, unfortunately, good for producing genetically healthy dogs. If you want a dog that won't bankrupt you with vet bills, get a mutt or a working breed.