Helping hints for a good cover story?

I suspect that having your gall bladder out is a good cover story for those with no need to know the real type of surgery one is having. I'm especialy concerned about my colleagues at work who are too sharp for a flimsey yarn. Yet I have know idea about the events which lead up to a gallbladder removal, or whether it happens on the spur of the minute (as in a n emergency), or whether people plan them based on typical symptoms of some kind or what??? Any help here would be apreciated.

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