Some months ago a friend experienced a nasty fall - she literally 'fell flat on her face': significant bruising, many stitches, but nothing broken. Nonetheless, a very painful and incapacitating experience. Apparently, the 'lace-loop' formed on one of her walking boots attached itself to the lace-hook on her other walking boot - no time to put her arms out to limit the impact, just splat! Have any of you had similar experiences?