Calvin and Hobbes by Bill Watterson for April 18, 1987
Calvin: Dad, how do people make babies. Dad: Most people just go to Sears, buy the kit, and follow the assembly instructions. Calvin: I came from Sears?? Dad: No, you were a blue light special at K-Mart, almost as good, and a lot cheaper. Calvin: Aauughhh! Dad: Dear, what are you telling Calvin now?!