Lame: I was going to school as usual. After I had arrived the bell rang and our biology teacher entered the classroom. He showed us a movie about wolfs.
Better: I was going to school when all of a sudden a wolf started hunting me. It almost got me the second I entered school but fortunately I managed to close the door behind me just in time. When the bell rang our biology teacher entered the classroom and showed us a movie about wolfs! Can you believe it? I grew incredibly nervous when the narrator began talking about wolfs attacking humans. While the movie was still running I turned my head away from the screen for a second and glanced through the door's window. At first I wasn't sure what I was looking at. I only sensed movement. But then it became clear that the wolf which had followed me earlier this morning was strolling down the hall. Somehow he must have managed to sneak in....
Of course, you don't need a wolf chasing you to have material for an exciting story but the general principles still apply I think.