Similar thing happened to me way back in the 80's. The history teacher assumed that every family had a video camera, and the big assignment for the year was for each student to make a video.

When I protested that I didn't have a video camera, she didn't believe me.

Being a resourceful youngster, I managed to get my hands on a second-hand security camera and interface it with my parent's VCR. I ended up getting a D on the assignment because the resulting video was in black-and-white.