There's a Reason Why I Don't Homeschool

Luke was singing his "days of the week" song to me over and over.  "Sunday Monday, Tuesday Wednesday, Thursday Friday Saturday...  There are seven days, there are seven days, there are seven days in a weeeeek!"
Just to avoid him starting it for the millionth time, I started singing Eight Days a Week.
When I was done it hit me that I might have messed up what he was learning so I said, "You know that's just a song right?  There's not really eight days in a week."
He replied, "I know.  There's 6 days in a week!"
Oops.