In Åre 2 seasons ago, at the 6 place lift, one of the adults accompanying the group slipped on the moving mat and fell face first. Normally not that big a deal, but she was prrrrreeeettttyy big, and the chair was immediatley behind her when she fell. The chair goes over her and gets stuck on top of her. They had to stop the lift, and it took her 1 or 2 minutes to squeeze out of the stranglehold of the chair...
Otherwise, in Vemdalen on a t-bar last year, a kid was showing off right in front of me, dragging his ski on the snow, doing caribous, and swerving back and forth. On one of his caribous he caught and edge and fell over. So he's in the caribou position, both legs pointing outwards, being dragged backwards up the lift. He doesn't let go, and get to the top unable to straighten his legs out...
Or i guess the millions of pile ups i've seen when a novice snowboarder comes off the lift, falls over, taking her friend down, them not moving, and the next batch coming right up behind them and crashing aswell... Ahhh, the Parisians in the Alps, priceless.