If you have an empty weapon slot and you pick up a green/blue/purple weapon in a battle (i.e. bind on equip), that weapon gets equipped without warning. I have not tried this for non-weapon slots, but it probably happens for other types of ship equipment as well.
Usually there is a prompt to say something to the effect of "Once you equip this, you cannot transfer it or sell on the exchange". Not game breaking by any means since most people do not fly around with empty equipment slots, but thought I would mention it.