I guess as a sheer fact, it can't be disputed. In late 2001 in OKC, all the plaques were taken down from the site of the former Murrah building that declared it the site of the worst terrorist attack within the US, to be replaced with signs declaring it the site of the SECOND worst terrorist attack within the US. City officials were VERY upset (because of the loss of life) at having to make that revision. I'm not sure I'd want to claim it as a 'record' - not in the competitive sense anyway.

As far as sick as in gross, I've always found the human body world records to cause a person to shudder.