Glass half-Full and Glass Chimera

AIG had been on the top.

but it stumbled and tumbled on a credit default swap.

All  Treasury's horses and all the Fed's men

couldn't put AIG together again. 

There was an old woman who bought a derivative;

 but when she got it she couldn't comprehend of it.

So she took it in the room where she sat to do bid'n it.

She unrolled it and folded it and wiped her behind wid it.