BB - Our overwing exit brief was useful when my J41 caught fire in1998.
An 18 year old threw it so far it slid under the aircraft on the next stand.
If you ask firemen about the evacuation situation they say people respond best to being shouted at. They cannot be expected to perform that well without direct action..one minute they are sitting in a nice aircond cabin...seconds later bangs/deceleration/aircraft breaks open and our totally untrained punters are so far up the stress curve they become cabbages.