For the record, here is the trade that broke it:
{"date":1362012123,"price":"31.9099","amount":"1","price_int":"3190990","amount_int":"100000000","tid":"1362012123917624","price_currency":"USD","item":"BTC","trade_type":"bid","primary":"Y","properties":"limit"},{"date":1362012124,"price":"31.9099","amount":"0.00019974","price_int":"3190990","amount_int":"19974","tid":"1362012124220533","price_currency":"USD","item":"BTC","trade_type":"bid","primary":"Y","properties":"limit"},{"date":1362012133,"price":"31.90998","amount":"1.0646","price_int":"3190998","amount_int":"106460000","tid":"1362012133549205","price_currency":"USD","item":"BTC","trade_type":"ask","primary":"Y","properties":"limit"},{"date":1362012147,"price":"31.91","amount":"20","price_int":"3191000","amount_int":"2000000000","tid":"1362012147416084","price_currency":"USD","item":"BTC","trade_type":"bid","primary":"Y","properties":"limit"},{"date":1362012147,"price":"31.91","amount":"9.28879034","price_int":"3191000","amount_int":"928879034","tid":"1362012147530876","price_currency":"USD","item":"BTC","trade_type":"bid","primary":"Y","properties":"limit"},
see here:
https://mtgox.com/api/1/BTCUSD/trades