Slightly evil trick: if someone is bugging you, ask a favor 10% beyond what you know they are willing to do for you. Shuts them down.
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Graceful failure: if you misestimate, you get them to do a large favor for you.
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Possibly related; If you know a person to be a control freak, you can promise them anything, just do it poorly.
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and if you estimate wrong, then they do things for you and it is probably even better





