because they're inbred
Leon-itis.
Shingles.
Cottage cheese.
Nacho cheese.
That's not nice.
Turkey and grease
Lettuce alone, without dressing. I remembered this today from a joke book I had when I was a kid. Wasn't sure if it should be here or /r/dadjokes
Lettuce pray they turnip.
If you were anymore inbred, you'd be a sandwich.
They're inbred.