I impulse-bought Evan a bike yesterday at Goodwill. It was outside the doors on the sidewalk and he fell instantly in love. After we got inside, Caroline melted down because I wouldn’t let her climb the display of Halloween knick-knacks while Evan stood quietly and angelically next to me declaring “I not naughty, Mommy! I a good boy!” I felt like it was $7 well spent in the scheme of positive reinforcement.. . .