When DS1 was eight months old, he heard the word "genuinely" for the first time.
He did a double-take and laughed so much I thought he'd be sick - you know that mad, chuckly baby laughing where they forget to breathe and go all shiny? He was still laughing in his sleep later that day (we said it a couple more times to check it really was the word...!). He still finds it funny now at 3.4.
And more recently, he's been finding his own word combinations that make him laugh massively - he had been laughing a lot at "flapjack", but then he coupled it with "jamjar" to make a tongue-twister and that's just the funniest thing ever. Well, unless you say "genuinely flapjack jamjar", obviously...!
Anyone else have a child who likes the sound of words this much? He's also fascinated by the sight of letters, words, me writing them, putting his hands on the TV when credits roll, reading letters off street signs, shop logos, etc, etc.