My soon to be 3yo had taken to calling every day "Friday."

"On Friday, we went to the post office!" (it was Tuesday)

"Daddy came home on Friday." (Saturday)

She calls it "Fy-day". She must think we are all saying "Five Day," however, because now when she doesn't want to say "Fyday" she calls it "Sixday."

"Mommy, on Friday, I mean Sixday, you cut my hair!"

"Rose made muffins on Sixday."

I'm wondering if "Sevenday" will be next. :)