10 "A Series Of Unfortunate Events" Fan Theories That Are Possible

8. The Baudelaire Orphans' parents killed Count Olaf's parents.

(Credits to http://asoue.proboards.com/thread/25209/tpp-theory-submitted-pj)

This one is more seen as fact by many ASOUE fans, but it's worth discussing. We know that Olaf's parents were killed by poison darts, and throughout the series there are quotes linking the Bauderlaire parents with poison darts at an opera.

In The Penultimate Peril Kit Snicket offers this:

"I remember that evening well. It was a performance of La Forza del Destino. Your mother was wearing a red shawl, with long feathers along the edges. During intermission I followed them to the snack bar and slipped them a box of poison darts before Esmé Squalor could catch me."

Later, in a discussion between Count Olaf and Klaus, this comes forward:

"Tell me what the weapon is that left you an orphan, and I'll type it in for you."

Count Olaf gave Klaus a slow smile that made the Baudelaires shudder. "Certainly I'll tell you," he said. "It was poison darts."

Let's recap: The Baudelaire parents did something ignoble with some poison darts during an opera, and Olaf's parents were murdered by poison darts. And the events are described as "fateful". If Olaf's parents were murdered by VFD, then Olaf himself might turn against VFD, and bring about the schism.

So the Baudelaire parents almost certainly committed murder, or, at the very least, greatly contributed to it. The former is more likely.