2. Yes duh. If you walk into a building with your friend and have just talked about how embarrassing it would be to slip and fall and what happens you slip and fall. You and all of your friend are going to laugh. What are the chances?
If you walk into that same building alone in a bad mood after stepping in a puddle and slip and fall. You are not going to be laughing, well you may but maniacally in a not so there in the head kind of way.