Cross your eyes!

I noticed this hilarious thing last week that Mackenzie is doing. She heard the phrase "Cross your eyes" from somewhere, but doesn't exactly know what it means. At the breakfast table this morning this is what goes on:
***I can't remember the phrase she was repeating, so I made this part up...***

Mack: I can read what that says, "Just add milk."

Me: You're a genius.

Mack: Let me see if I can do it with my eyes closed. "Just add milk."

Me: You're a genius!

Mack: Okay, now, with my eyes closed AND with my eyes crossed! "Just add milk." And this is what she did: