Sir Ian McKellen, who plays Gandalf in the Lord of the Rings movies, gave some exam advice to pupils whilst on a visit to a school near Bristol.
The words were actually lifted from his Lord of the Rings character Gandalf...
Speaking to a group of excited students, McKellen asked: "If you don't do your revision properly do you know what will happen?"
Before bellowing, "You. Shall. Not. Pass!"
Check out the clip, courtesy of Chew Valley School.