PHP won't run model functions from terminal

[eluser]bndk[/eluser]
Good evening,

When I try to to run a controller's method from the terminal like so

php index.php some_controller some_function

with the following function body

Code:

function some_function() {
       echo 'I like eggs';
    }

it works like a charm, outputing the string as expected.

However, when I load a model and try to call one of its functions from the controller, nothing happens.
I tried to call the same model function from a web browser and it did what it was supposed to do, so I know there's not a problem with the function.

Does anyone have an idea as to why it doesn't work?

Your help is much appreciated