I am quite sure if he had seriously hurt himself, was cut badly, broke a bone, knocked himself unconcious or similar you, or anyone else, would have been in there trying to help. But slip on a banana skin, dog poop, walk into a lamp post and I think the majority of us will see the funny side of that. Lets face it a lot of the early comedy was slapstick where people were apparently "getting hit or hurt" and going from one incident to another.
You are normal.
Roger