When my daughter was 3. We were walking home from nursery and an ambulance went past. She looked at me and said 'people die in ambulances' as she was only 3 I tried to reassure her but she got very upset with me. She went on to tell me that she died in an ambulance when she was a little boy, She was in a car crash with her dad but he couldn't get her out.
The next day she started talking about a man called Ben who used to come visit her every night. She said he had a poorly leg and used to wake her up to ask if she was ok. This went on for months until we moved house.
Frightened the s*** out if me.