Calvin and Hobbes by Bill Watterson for June 23, 1990
Dad: It's getting dark, Calvin. Time to come in and go to bed! Calvin: But Hobbes and I were catching fireflies. Can't we stay out a little longer? Dad: Ha! First you didn't want to go out, and now you don't want to come in! See, by not watching TV, you had more fun, and now you'll have memories of something real you did, instead of something fake you just watched. Calvin: Nothing spoils fun like finding out it builds character.