When Boq saw the very long line for the knife to sharpen pencils, he realized he should have sharpened his pencil at home before coming to school. When Boq saw that his fountain pen wrote in red ink instead of the requested blue, he realized he should have checked the ink before he began writing. When Boq saw the famous, beautiful, completely green Thropp Third Descending walk into the classroom, he realized he should have tested the waters before jumping in.