All of the following occurrences happened in my old house in Arkansas where I lived with my parents Bob and Sarah and my older brother Joseph / Joey. My parents have since moved out, Joey was sadly killed in a car accident five years ago and I now live in Texas.
The first time I ever had an 'encounter' with my guardian angel, was when I was five years old.
I can faintly remember sitting at the top of the stairs, looking down, my legs dangling over the first few steps. I heard a faint whisper in my ear. Something like "Be careful, sweetie. Don't fall down the stairs". The voice was female and sounded sweet. I replied to the voice (I was five; I didn't think it was strange that I could hear voices). I said, "I won't. But who said that?" There was no reply. My mother was in the kitchen at that time and she heard me talking to someone. She walked out of the kitchen and asked who I was talking to. I replied, "I don't know." She shrugged it off and assumed I was talking to my brother (that's what she told me later, anyway).
The next encounter was when I was twelve.
It was summer, and I was in the backyard with my brother. We were drenching each other with buckets of water, trying to cool down. I must inform you now, that our house backed onto a large field. The grass was overgrowing, reaching up to my shoulders, and most of the teenagers in my town used to go down there to make-out with their girlfriends or drink alcohol. There was crushed Glass everywhere from broken bottles and my mother used to warn us to never take off our shoes around there or we'd get glass in our feet.
I had just soaked my brother and started to run away before he could get me back. I decided to hop over the fence that divided the field from our backyard. As I hopped over, one of my sneakers fell of and landed back in our backyard. Being the lazy twelve year old I was, I decided to leave it there and just carefully step over any glass I saw. I started zig-zagging through the field, not exactly concentrating on looking for glass, when I saw this white mist ahead of me. I stopped and stared at it for a few minutes. Then I heard the female voice again, the same one I had heard when I was five. She said, "Look down". I obliged, and lo-and-behold, there was two smashed bottles at my feet. If I had taken one step forward I would've cut my feet to shreds. I mumbled a thank you to the mist and ran all the way back to my house. From that moment on, I really believed that I had (and still have) a Guardian Angel.