You could improve this further by replacing your second version:

int something(int goofy, int mickey)
{
bool isBigger = (goofy > mickey);
if(isBigger)
return goofy;
return mickey;
}

with this:

int something(int goofy, int mickey)
{
if(goofy > mickey)
return goofy;
return mickey;
}

As there is no point caching the result of the goofy > mikey test if you are not going to use that result again within the method.

You could go one step further and use the ternary operator and write the method like this:

int something(int goofy, int mickey)
{
return (goofy > mickey) ? goofy : mickey;
}