EDIT: I didn't write this poem! Someone at Maxis did. In the original Sims game, the description of the Gunea Pig painting is this very poem!
THE FORGOTTEN GUINEA PIG
When the house is warm and the food is hot
The guinea pig cries forget me not
Alas, some Sims may clean their own,
Only to forget a guinea pig�s home
Hungry and cold, a pig feels no love
This breeds contempt for masters above
Expecting to play after many a night.
Who is surprised by the guinea pig�s bite
Uncleaned, unloved a pig�s life means naught
Like a child�s play thing,
It is simply forgot,
But warnings to all who turn a deaf ear
Let the curse of the guinea pig always bring fear