Where Go?

For the last month or two Rylan has really liked hididng behind the curtain (even behind the shower curtain) to play hide-and-seek. I'll say "Rylan, where did you go" and he'll repeat "where go?". So I'll say "Ry Ry" and he'll say "wy wy". I'll keep calling for him as I sneak up and whip the curtain away. He'll squeel in delight and then run to hide behind the curtain again. Sometimes he'll jump out at me before I open the curtain, but he'd rather I find him first...maybe it's the surprise of when I'm going to come.