Line?

When I was in elementary school, I was the narrator in a Christmas play. Everything went fine during the practices. Everyone knew their lines.

During the actual performance, the boy playing Santa Claus made his entrance, and forgot his line. Everything stopped. As the narrator, I had the script in front of me, but didn't give him his line. The director, a teacher, also had the script, but didn't give him the line. The other kids on stage were without scripts, but knew (approximately) what the line was, and they said nothing.

Forever went by while the audience just sat there. Finally, another teacher came up to the director, took the script, and gave him the line.

But that feeling we all had, standing there? That's what writer's block feels like. Your characters are right there on the screen, and they're not giving you their lines.