Sometimes I call on random students to answer questions. Today a boy was reluctant to stand up, which is not unusual, but then he kept trying to pull his t-shirt down, which is less so. Everyone started laughing and I feared it was a puberty related embarrassment, but no. Rather, this boy had rolled the legs of his shorts up and tucked them in so it looked like he was wearing little denim underpants. An effective use of class time if ever I've seen one.