I'm sitting with my 7 month old son, reading some Groupthink, when suddenly I realize that my son is licking my arm. So I say to him, "Hey, you, quit licking my arm!" And he waits a full 30 seconds before he looks up at me with a look that totally says "What's that, mom? Sorry, I couldn't hear you, I was licking your arm." And then he blew me a raspberry.