Bob? Where's Bob?

Luke has been such a chatter box lately, and will appropriately say Dada, Momma, nana (banana) and, daw (dog- Hudson).   And this past week, he has added a new word to his vocabulary- Bob.  We have no idea who Bob is, or where he came from, but all we hear about now is, "Bob".  I think Bob is Luke's new imaginary friend.  And it seems this friend is VERY good at playing hide and seek!  Luke will crawl all around the house calling out for Bob in a questioning voice, Bob?, Bob?, and will even look for Bob inside any box, stroller, bathtub, closet, or cabinet he can find!  Even when taking him for a walk, Luke is looking out for Bob.  I guess we will keep looking for this mysterious Bob.  If you've seen him, please let Luke know :)