My teacher gave the class a seemingly straightforward Harry Potter trivia question for extra credit. Is he trying to trick us?

The question is: "What was the first Harry Potter movie?" (name and year of release). He says to "be careful" with this one. Is he just messing with our heads? I mean, is the answer not "Harry Potter and The Sorcerer's Stone"? Was there ever some other, unrelated movie named "Harry Potter"? Or perhaps an indy film?