Advice from certain classes of teammates -- like The Ditz, or the Token Evil Teammate afflicted with Chronic Backstabbing Disorder -- can usually be safely ignored. But, if a person (let's call him Bob) is wrong consistently enough, then Bob's teammates will eventually find his advice useful -- by reversing it first. If Bob says to turn left at the fork, Alice will turn right. If Bob says, "Gee, Dave sure seems trustworthy to me!", Alice takes this as a sign that Dave is not to be trusted. And if Bob says, "Don't touch that, you fools!", Alice knows that it's critically important that they touch the object in question as soon as possible.