...I overheard two male students conversing:
STUDENT #1: You are such a goody two shoes.
STUDENT #2: You'd be surprised.
S1: What have you ever done wrong? Walk down the street with your shoes untied?
S2: Drunk driving.
BOTH STUDENTS: <silence>
ME: <uncontrolled laughter>
BOTH STUDENTS: <<double glare at me>>