Optimus' grin widens slightly, and then his hand is swirling with the blue and red twinkles. "Diet Coke corrodes fuel tanks. Try... this."

The twinkles die away, and he lowers his hand to display a tray holding a large mug of something dark and fizzy, and a pizza that's been folded in half, dipped in batter, and fried, then accompanied by sliced, deepfried lotus root. If Lucy should take the provided fork and knife and open that pizza she'll find it to contain abnormal but still reasonable amounts of fresh ripe pineapple, and the most delicate and delicious salt cured and unsmoked ham she'll have ever run across.