Most of us know (or are) someone who at one point or another has walked through a screen door because they didn't realize it was closed.
I might have the only son who fell through a door because he thought the screen was there, but it wasn't.
Last night Brian and the dog went out on the deck, and Brian neglected to close the screen behind him. Ben wandered over to the doorway, and leaned forward with his hands up so he could lean on the screen and look outside. However, there was no screen, so he fell right on his cute little face through the doorway and onto the deck. Poor little man. Fortunately he only cried for a few minutes, and then was back to his normally cheerful self.