Yes, I have. Well, actually another person did it for me. It happened this summer when I went to the beach with my children. When I got there, before to go for a swim, my oldest daughter fell fainted on the sand. At the beginning, I thought that she was joking and I tried to pick her up. However, when I saw her eyes in white I realized what was happened. I got scared and I started to ask for help. A younger rang to the emergency medical services. Fortunately, she quickly regained her consciousness.