nothing has happend to me on a t-bar, but once some friends ahead of me where messing around and I had to pick up a ski, and pole and I think something else on the way up, they made it up fine haha.
for me, on a poma lift my leggs hurt like hell when I was teaching a friend how to ski, so I sorta was laying down not watching ahead of me, and my edge cought something and I fell off half way up, felt stupid infront of my friend haha.