"Yes," he says patiently, "we make it in the kitchen. From ingredients that either grow in the ground or come from animals." He pauses to give Rincewind a serious you're weird, kid look. "You don't want to eat things that come from dirt... but you're fine if they were under rocks."
"And do you listen when they tell you, or just run away?" he asks sternly.
"You get into a pet or a panic attack and become careless," Xel informs him. "I've seen you do it at least a dozen times today alone. That's why your ear is currently bleeding. Now, today I haven't given you a time limit, so just walk upright and carefully, ne."