It largely depends on the pot but as a general rule you don't want them to be too finely ground. I prefer a cafetiere/French press.

Shove it up your arse

I got tired of the french press thing long ago. My moka pot has perforated metalic disc filters similar to what you see with some styles of french presses, so I guess I was right in using the same grind size.

Is it one of those mornings for you, Eyesore?

Whatever is in that Tassimo capsule.

Roasting and grinding your own beans is such a faff but if you must, I suggest you try this and then try to replicate it as closely as possible.

Whatever comes out the vending machine.

I grind my own beans but I leave the roasting to the professionals. I tried it once and it smelled like burning tires. Thank goodness that was outdoors in a dutch oven or that may have put me off coffee for quite a while.

Dutch ovens always stink.