If you have prepared a meal from your cargo!
Hell, often better than airport food.
Another one is (as a flight mech or loadie), waking up to a sunrise at altitude and fixing/eating breakfast in your underware and enjoying a breakfast in the cockpit from a vantage point few can understand. Getting dressed in time to strap back in before we land.
Nothing like eating breakfast in your underware in the cockpit of an an aircraft just like it was your own kitchen as the sun crest's the earth...