Comment-spammers threaten to sabotage their victims through Google Disavow if the evidence of their vandalism isn't removed

Tim got an email from someone trying to get rid of comment spams — ever since Google started punishing sites that left comment spam on blogs, this has been going on a lot. When Tim told the guy to buzz off, he threatened Tim with sabotage by means of Google's "Disavow" tool, growing progressively more abusive as Tim stood his ground.

Gordon Sands Threatens Seattle Bubble with Google Disavow in Misguided Attempt to Clean Up BankruptcyAction.com Comment Spam

(Thanks, Tim!)