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pragma solidity ^0.4;

contract BigSpender {
    uint writeToMe;
    
    function writes(uint){
        writeToMe = 1; // this throws if gas given is less than 20k
    }
}

contract ThingDoer {
    BigSpender bigSpender = new BigSpender();

    function anotherWay(){
        if(!address(bigSpender).call(bytes4(sha3('writes(uint256)')), 1)){
            // if the external call fails because OOG, we'll return
            return;
        }
        else {
            // if the external call succeeds, we'll throw
            throw;
        }
    }
}