Although he appeared shy, this Defense Against the Dark Arts Master was two faced.
Who is Quirrell?
Body binding, freezing and paralysis are the result of this spell.
What is Petrificus Totalus?
This person and his wife Sarah were old when they had their child. When the visitors told him they would have a son and their descendents would number more than the stars in the sky and the grains of sand in the desert, he laughed.
Who is Abraham?
A handful of this contains about 10,000 of grains of them, more than the number of stars we can see with the naked eye.
What is sand?
The name of this actor.
Who is Daniel Radcliff?
This Defense against the Dark Arts master spent most of his year locked inside of a trunk.
Who is (Mad Eye Moody?
This spell prevents others who are nearby from overhearing your conversation.
What is Muffliato?
He was a dreamer, and had many jealous brothers who sold him into slavery.
Astropecten armatus is more commonly known as the spiny this.

What is sand star?
The actor shown here plays Sir Patrick Morgan in the movie, Wonder Woman, and plays the part of this character in the Harry Potter movies.

Who is Remus Lupin? (or Who is David Thewlis?) Both answers accepted.
This action by this person meant that Hogwarts couldn't keep a Master of Defense against the Dark Arts for longer than a year.
What is being cursed by Voldemort?
This spell leaves its target covered in boils.
What is Furnuculus?
He reluctantly took on a leadership role, but not until a burning bush told him to tell the pharoah to let my people go.
Who is Moses?
The action filled Sail Barge scene from this movie was filmed at the Imperial Sand Dunes (also called the Algodones Dunes), in California.

What is Return of the Jedi?
This actor, seen in the 1997 movie The Borrowers, plays an unpopular character in the Harry Potter series. 
Who is Tom Felton? (Who is Draco Malfoy?) Both answers acceptable
Known as Moony to his friends, this Master was Harry's favourite Defense against the Dark Arts teacher.
Who is Remus Lupin?
This spell turns a set of stairs into a slide.
What is Glisseo?
This man was surrounded by tricksters.... first his (future) father in law tricked him into marrying the wrong sister. Later his son Jacob tricked him into giving Esau's blessing to him.
Who is Isaac?
This song by One Republic knows that the number is infinite.
What is "Counting Stars"?
This actor played General Hux in The Force Awakens, was the voice of Thomas McGregor in Peter Rabbit and played a part in the Harry Potter movies.
Who is Domhnall Gleeson? (Who is Bill Weasley?) Both ok answers.
This Dark Arts Master required his students to buy all of his many books.
Who is (Gilderoy) Lockheart?
This is the spell to use if you are in danger from dementors.
What is Expecto Patronum?
Although he was a poetic king, he's often remembered for slaying the giant Goliath.
Who is David?
Silica makes up part of this substance and is found in sand. It's origens are out of this world.
What is stardust? (What is cosmic dust? What is dust from a supernova?)
Seen here as the dance teacher in Billy Elliot, she's also starred in Mamma Mia and the Harry Potter series as this popular character.
Who is Molly Weasley? (Who is Julie Walters also okay answer.)