My worst in this department was last year. 9 Dutchmen out to a work platform.
It was a very short trip on a VFR day, so we offered a good payload. The manifest came back with a payload of over 3200lbs. The average pax weight I calculated out as 306lbs!!
The amusing thing is, the oil & gas companies come back moaning why we can't take 9 or 10 pax any more!