We had a rule during apprenticeship that we would would ask questions if we saw that a fellow was struggling to comprehend - and was too slow / shy to ask on th

We had a rule during apprenticeship that we would would ask questions if we saw that a fellow was struggling to comprehend - and was too slow / shy to ask on their own, even if we already understood. We would ask these questions as stupidly as possible (within reasonable boundaries, of course) to make the teacher not just repeat what they already said but to make them find another way to explain it. That's when I learned that ego has no place in learning.