This conversation actually happened. In the carpool line. Today.
Me: Landon, today you have tumbling class.
Landon: No, Mrs.Slusher said we have tumbling class tomorrow.
Me: Did she tell you that yesterday?
Landon: The last time we were at school she said, "Tomorrow you have tumbling class."
Me: That was yesterday. So that means you have tumbling class today.
Landon: So 'tomorrow' means 'today'?
Me: No, tomorrow means the next day after today. Yesterday she said you had tumbling class tomorrow. So now that we're in tomorrow, it's today.
Landon: (Complete silence and looking at me with eyes glazed over.)
Me: I have no idea what I just said. I love you, Landon.
Landon: I love you too, Mommy. (Then he got out of the car and walked into school.)