I usually change my accent during the chair ride, British to Aussie to Cheesy Quebecois to Russian, changing my story the whole time.
This wasn't on a ski hill, rather at a summer camp:
I managed to convince 90 or more people that I was a Mexican, Hulio Ricardo Cortez Jesus the Second, (I shit you not), and that I spoke in a British accent because I had gone to Oxford. I was 15 or 16 at the time. I shit you not. Most of these people were 15+, some were over 40.