Jack o'clock
Jack o'clock is when your brain is like a toilet and all you want to do is flush it with your own hand.
I was reading a book and it was Jack o'clock. I closed the book and my hand went to work.
I was walking down the street and it was Jack o'clock. I had to hide behind a bush.
I was talking to my crush and it was Jack o'clock. I blushed so hard I turned red.