A high school teacher was giving a true/false test. He was strolling up and down the aisles surveying the students at work. He came upon one student who was flipping a coin, then writing.

Teacher: What are you doing?
Student: Getting the answers to the test.
The teacher shook his head and walked on. A little while later, when everyone was finished with the test, the teacher noticed the student was again flipping the coin. 
Teacher: Now what are you doing?

Student: I'm checking the answers!!