Matt Parker, a stand-up mathematician and author of 'Humble Pi,' brings humor to the world of math. He discusses the notorious off-by-one error, illustrating how common mishaps can lead to big consequences in programming and everyday life. Parker shares funny anecdotes about counting birthdays and a historical flight error due to measurement confusion. He emphasizes the importance of embracing mistakes as opportunities for growth, encouraging everyone to see math as an accessible, relatable part of life.