At an amusement park in a dystopian future, Miss Polly holds a spot in line for a terminally ill customer:

I’m a line-sit for the Ultimate Roller Coaster. At first, I thought the job would be depressing, everyone standing in line waiting to ride-n-die, but what I do is altruistic. I’m helping my clients out, making it easier for them to accept the end.

This story is full of gallows humour, clever worldbuilding and has a beautiful and touching ending.