Not unless you count anesthesia in a hospital.
Cathie,
54
Novi, MI USA
Once when I was about 6. I was rolling on the front lawn and made a turn. We have a brick wall. I rolled right into it and knock myself out, I had stitches put in the scalp and a tetanus shot,.
Janet,
46
E. Brunswick, NJ USA
No, thank goodness!
Tam
I don't remember.
Jill,
61
Saylorsburg, PA USA
No.
Jane,
63
West Linn, OR USA
Not to my recollection.
Alias Irrelevante
Not that I recall
Felicia,
38
Lowell, MA USA
Nope. Not knocked out cold. I've passed out cold. Back in the day.
Laura,
39
Lowell, MA USA
I've been unconscious. I had surgery.
Karen,
23
Ames, IA USA