Grave issues...

There is a very grave disease... For pun there's no apology! Bear with me, if you please... It's known as genealogy! Looking up the family tree... Should evince nostalgic sigh! Not so kosher, oh! dear me... My sleeping dogs must lie! Epitaph odd, to say the least... In fact it's most surprising! Here lies Johnny Yeast...* Pardon me for not rising! The cemet'ry antics of four worms... Two grundies cried: a disgrace! Just the thought, and one just squirms... The other...a smile on her face! Two worms engaged in a grave conversation... The frowns on their faces the sternest! The other two caused great consternation, By making love in dead Ernest! *This is the exact wording said to be inscribed on a headstone in a New Mexico, USA cemetery.