What's a bit of good advice that's really bad advice?

You know, like "always split on 18," or "having kids is the most rewarding thing you can do in life."

What's that one bit of advice you got from a trusted friend that you know deep, deep down would just ruin your thing?

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"Look before you leap" vs "He who hesitates is lost"

"Many hands make light work" vs "Too many cooks spoil the broth"

I don't know that those have to be in conflict... If you make a 1 word change to the second. "Too many chefs spoil the broth". Good to have extra hands helping, in almost every case - but only if the hands are well directed. If everyone thinks they're in charge, or doesn't know the scope of where they're in charge, odds of success drop.

I liked it the way it was thank you. I guess too many editors spoil the sentence. ;)