Where's your homework, Jo?

True story: This did happen to me several times in my mid teens at my last school for things like incomplete or non-existent homework set which you had a separate book to write down your homework assignments and due by dates.
Basically I was being lazy not really wanting to do something every other kid at school had to do to get decent grades. Just saying you were 'disappointed' meant nothing at all as I didn't care about never mind you.