Calculus Teacher Coffee Mug 11oz - Minus One Point, You Forgot the Plus C

"Minus one point. You forgot the plus C." An 11oz mug for grading night. The art is the quiz everyone has seen: lined paper with punched holes, an integral worked out by hand, a red caret pointing to an empty circle where the +C belongs, a circled -1 in the margin and a red pen lying at the corner of the page.

A cheerful gift for a calculus teacher, a tutor or a math department exchange, and a fond reminder for a former student who finally remembers the constant. Coffee first, then the stack of quizzes.