My 3-month old girl: Heh!
Me: Heh!
She: He-eh!!
Me: He-eh!!
She: HE-EH!!!
Me: HE-EH!!!
And so on and so forth for another minute or so, volume getting louder & louder, till:
She: HE-EH-(hic)-EH!!!!!
Me: ????
She: HE-(hic)........(hic)........
Reduced to hiccups by the sheer force of her "Hehs", thus ended our first mother-daughter chat!!!