I was once sat on the back row of an A320 on ramp before takeoff at Toulouse when the cabin crew kindly asked if myself and five of my fellow travellers would move to various other seats further towards the front of the Aircraft. This was apparently due to a problem with the weight distribution as expressed by the Captain.
I was surprised, as I didnt think six averagely built back row passengers would effect aircraft performance during take off or cruise etc or effect weight distribution to a great degree.
Any comments?