Penguina,
As a complete contrast, I took my neighbour and her 12 year old son for a 40 minute trip down to EBSP and back for a cup of coffee last Saturday. The son had flown with me once as a 6 year old but this was the ladies first trip in a light aircraft. The trip down was initally a little turbulent and, soon after take off, I glimpsed (she sat in the back on the way down) her white knuckles clutching the back of her son's seat. She managed to survive it and my ropiest landing ever.
Back at base I was kept high and thrown a threshold base into the bargin. The subsequent slowing down and getting down produced another couple of white knuckle moments for her. Despite this she appeared at the door a few hours later, with that silly grin on her face, to let me know how much she enjoyed the new experience.
So stress or not, I don't cut your passenger too much slack. My 2p worth .... unmannerly to$$er!