Did Mel Gibson Hit Oksana Grigorieva's Son?

The accusations against Mel Gibson keep piling up. The actor's ex-girlfriend, Oksana Grigorieva, claims he grabbed her son and threw him on a table in a rage.

All over a cigarette, no less.

Oksana's son is 12, and his father is her ex, Timothy Dalton. The potential significance of the cigarette incident with Gibson is that may have been witnesses.

That's a stark contrast to the Mel Gibson tapes, which - despite their awfulness - were recorded without his consent, in unknown context, and possibly edited.

With regard to the alleged attack on Oksana's son Alexander, who also goes by Sacha, the boy was playfully trying to knock a cigarette out of Mel's mouth.

Oksana claims that Mel just exploded, grabbing the boy and throwing him violently onto a table. The issue came up during their custody mediation in May.

At that point, Mel and Oksana were trying to work out an custody deal for daughter Lucia, eight months - and a financial settlement that involved the tapes.

For reasons unknown, Oksana left $15 million on the table.

In any case, Oksana's people informed Mel's lawyers of the attack, while his camp says "numerous adults and children" saw the incident - and differently.

Mel's lawyers claim witnesses will say it just goofing around and Mel did not get physical with Sacha, who accidentally fell as he was jumping for Mel's smoke.

The criminal domestic violence investigation hinges on credibility. Right now, it's hard to establish who has it. The tapes are bad, but criminally, prove little.