Wait till u see the test

Some phrase a teacher tell's a student especially in PE who doesn't do any work or studying in that class just because they know the work isn't for a grade. And thinks its just a period to have fun, play sports and talk with your friends etc. But in reality at the end of the quarter or whenever they have a test they will be shocked and wont know jack shit and will fuck up not only on the test but might fail the whole class as a consequence

Coach: Fritz you working
Other student: you know he never does work
Coach says to Fritz: just wait till u see the test

Fritz shouts: oh theres a test!!!
Classmate: yes dumbass
Fritz: its for a grade!!!
Classmate: yes stupid dumbass wake up and smell the coffee