something similar happened to my friend, who, at the time, was quite a deal older than 10 yrs, but anywho, had suspender pants but wasn't wearing the straps, just letting them dangle when a clasp got caught in the chair.  He was fine till he tried to get off and couldn't ski away from the chair, which swang around, hit him in the back and knocked him on his belly.  He was then draged through the useless stop gate, the snow on the other side of the disembarking area, before being suspended like 10 feet in the air before the lifties stopped it.  There he is, everyone laughing, including a couple lifties who were not doing anything but laughing, while he had the biggest wedgie of his life!!!!