Day in and day out

One fine day a 5yo was in deep thought while having breakfast and suddenly had to share his revelation with me -

"Appa, you know what? Everyone knows it's a day."

"Hmmm..so?"

"So no need to say Saturday..just say Satur!"

"That would make life easier, yes"

"Wednes, Sun, Mon..."

For the rest of that weekend, he tried convincing every adult he met to optimize language till he called it a day.