Telepathic

I was practicing the piano this morning when Josh came in with a big grin on his face and said "Mom, did you think you were playing a different song than you were?"
"Mmm, no?" I said, unsure of what his point was but trying to make sure I didn't hurt his feelings.  "Why?"
"Because when you were playing I was singing a different song in my head and then I heard the piano playing the song in my head.  So I thought really hard about it and tried to make it so that you could hear my song too."
"Hmmm."  What do you say to that?  "What song was it?"
"Oh, just one I was making up."  And he starts singing "I love playing my DS.  It is so fun it is.  Have a holly jolly Christmas Mom."

(As a side not, Josh was watching me type this and I had put a period after "fun" and he stopped me and told me that there wasn't a period after that word, it wasn't until after 'it is'.)