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."