"Isn't it?  Perhaps I don't grok all its fullness yet.  But find me something that really makes you laugh, sweetheart... a joke, or anything else - but something that gave you a real belly laugh, not a smile.  Then we'll see if there isn't a wrongness in it somewhere and whether you would laugh if the wrongness wasn't there." He thought. "I grok when apes learn to laugh, they'll be people."