“Pig’s blood”

LORELAI: Well, I think you’re actually making some friends here.
RORY: Let’s not get ahead of ourselves. They’ve basically just moved off the plan to dump the pig’s blood on me at the prom, that’s all.

Rory is referencing the 1976 horror film Carrie, based on the novel of the same name by Stephen King – his first novel to be adapted to film. It was directed by Brian De Palma, and starred Sissy Spacek in the title role. The film is about a shy, unpopular sixteen-year-old girl named Carrie who is regularly bullied at school.

When Carrie is persuaded to attend the school prom, some bullies rig the election so she is crowned Prom Queen, then dump a bucket of pig’s blood on her when she comes on stage to accept her crown. As Carrie has telekinetic powers, mayhem ensues as she takes her vengeance against everyone who witnessed her humiliation.