A car has eight wheels

"How many wheels does a car have?" asked a teacher to a student. The student replied "eight wheels". The teacher, irked by the ignorance of the student asked him to think again and answer. The student stood by what he said. The teacher, losing her cool, took the student out to the parking lot, made him stand in front of a car and asked him to explain how he said a car has eight wheels. The student said there are four sides for a car and each side had two tyres. If I'm doing my math correctly, 4*2=8. The teacher fainted.