Little Johnny goes to the teacher after class and asks:
- "Can a student call teacher a 'pig'?"
- "No! Most certainly he may not!"
- "And can he call pig a 'teacher'?"
After carefull thinking she replies:
- "Yes... I suppose one could"
- "OK then! Goodbye...... TEACHER!"

Teacher calls Johnny after class and asks:
- Why are you always late for school?
Johnny replies:
- Because there's a warning sign on the corner that says: "Slow down - school ahead!"