First Day of School!

Enter Kindergarten student who turns five next month (end of October), literally bouncing into the room today.
"Teacher! Teacher! Teacher! It's my first day of school!"
"Yes, A, it is! I'm glad you are here!"
"And, TEACHER! Tomorrow will be my SECOND day of school!"
"That's right, what a smart boy!"
"Then, after THAT, is my THIRD day of school!"
(By now I am trying desperately to keep from laughing, which means not making eye contact with any of the adults who are within earshot!)
"You are right, A. The next day will be your third day."
"TEACHER! Then comes my school day four! FOUR! Like ME! I'm FOUR!"

*sigh*
What a great way to start the year!