Bonanza Hand` (What are the Odds)

[six_4off]

I was playing at my home game last night and I saw insanity. We play .25 and .50 blinds pot limit game. The game is also pretty weak so we'll call the players involved, Nemo and Flounder.

Flounder opens in MP w/ a pot sized raise. (Standard Raise.)
Folds to Nemo who calls.

2 players to the flop

Flop comes A [img]/images/graemlins/spade.gif[/img],A [img]/images/graemlins/club.gif[/img]9 [img]/images/graemlins/spade.gif[/img]

Flounder bets out for a pot sized bet, Nemo calls.

Turn comes 9 [img]/images/graemlins/club.gif[/img]

Flounder pushes his last 7 dollars in the pot.

Nemo thinks and counts chips for about 5-10 secs and calls.

Flounder says "If you take this pot I'll burn your house down!" as he flips 9 [img]/images/graemlins/diamond.gif[/img] 9 [img]/images/graemlins/heart.gif[/img].

And Holy Kerosene Batman! Nemo shows A [img]/images/graemlins/diamond.gif[/img]A [img]/images/graemlins/heart.gif[/img]

I was just kinda curious as to what the odds of this happening are. Can anyone help. I also have a bet w/ Nemo. I said that 2 quads were more rare than a Royal Flush, He disagreed. Any thoughts??