one of my hockey teammates older brother did the roll number thing during a test. as soon as he was given his last warning for going over the time limit as kids were finishing, the TA (adjudicator) just said he wont take the test and chuckled. so he just walked up and slipped it into the middle of the stack, then laughed and walked out. pretty sure it was marked too and all went well or it was all a lie because hes kind of a faggot but whatever