Code:

$ bitcoind getinfo
{
   "version" : 31900,
   "balance" : 100.41318448,
   "blocks" : 118195,
   "connections" : 25,
   "proxy" : "",
   "generate" : false,
   "genproclimit" : -1,
   "difficulty" : 82347.22294654,
   "hashespersec" : 0,
   "testnet" : false,
   "keypoololdest" : 1291293105,
   "paytxfee" : 0.00000000,
   "errors" : ""
}
$ bitcoind sendtoaddress 15hZrw6V2HaWZShQsQASKYwhYjkCpT6Byd 100.41318448
error: {"code":-4,"message":"Error: This is an oversized transaction that requires a transaction fee of 0.14 "}
$ bitcoind sendtoaddress 15hZrw6V2HaWZShQsQASKYwhYjkCpT6Byd 100.41
error: {"code":-4,"message":"Error: This is an oversized transaction that requires a transaction fee of 0.14 "}
$ bitcoind sendtoaddress 15hZrw6V2HaWZShQsQASKYwhYjkCpT6Byd 100.4
error: {"code":-4,"message":"Error: This is an oversized transaction that requires a transaction fee of 0.13 "}
$ bitcoind sendtoaddress 15hZrw6V2HaWZShQsQASKYwhYjkCpT6Byd 100
454825ecea7a89564b3751521e0d98215c76b4f83aa5284b62846621ecb7b587
$ bitcoind getinfo
{
   "version" : 31900,
   "balance" : 0.28318448,
   "blocks" : 118195,
   "connections" : 25,
   "proxy" : "",
   "generate" : false,
   "genproclimit" : -1,
   "difficulty" : 82347.22294654,
   "hashespersec" : 0,
   "testnet" : false,
   "keypoololdest" : 1291293105,
   "paytxfee" : 0.00000000,
   "errors" : ""
}

And the fee for the transaction still acted without question or confirmation! http://blockexplorer.com/t/3dH5rnVCPr

Code:

$ bitcoind gettransaction 454825ecea7a89564b3751521e0d98215c76b4f83aa5284b62846621ecb7b587
{
   "amount" : -100.00000000,
   "fee" : -0.13000000,
   "confirmations" : 10,
   "txid" : "454825ecea7a89564b3751521e0d98215c76b4f83aa5284b62846621ecb7b587",
   "time" : 1302709644,
   "details" : [
   {
   "account" : "",
   "address" : "15hZrw6V2HaWZShQsQASKYwhYjkCpT6Byd",
   "category" : "send",
   "amount" : -100.00000000,
   "fee" : -0.13000000
   }
   ]
}

In fact, the console client stole my money and gave them to miner.
GUI client is asked to pay for a large transaction.
Looks like ugly coders for some reason decided to always answer yes to this question from the console. :^/

Discussion in Russian: http://bitcointalk.org/index.php?topic=5796.0