Halloween Costume Confusion

My boy keeps saying he wants to be a ghost for Halloween.  No, a Ninja, No, a Skeleton.  Or maybe Batman.  So we went to Wal-Mart yesterday to look at the costumes.  I'm thinking he will be inspired and pick the one he wants.  I showed him the skeleton costume and he was scared of it (haha!)  After a while of holding up every costume on the rack, he still couldn't decide.  We went to leave that aisle, we come around the corner and he spots this cool stuffed dinosaur costume where it looks like you are riding the dinosaur?  And that was the one he fell in love with!  So we now have a dinosaur costume.