Years ago flying offshore from Aberdeen.
The so-called standard weight for the offshore passengers was 180 lbs.; 170lbs for him plus 10lbs. for his wet suit etc.. This oil company had a policy where they were weighed individually because that, in most cases as they weighed less, they could get more freight on.
I planned the trip and sent down the payload to traffic. They phoned up shortly after and asked if I could take some more to which I refused. Later on along came the manifest and I noticed that the passenger weight was an exact multiplication of 180lbs.
I went down to query this remarkable coincidence.
"They were too heavy when we weighed them so we reverted to standard weights."