Final answer:
In “Harry Potter and the Half-Blood Prince”, Fred and George did not pelt Percy with anything when he arrived with Scrimgeour on Christmas Day; they instead mock him for his strained relationship with the family.
Step-by-step explanation:
The incident you’re recalling takes place in the book “Harry Potter and the Half-Blood Prince” by J.K. Rowling. In this specific event, Fred and George do not pelt Percy with anything when he arrives at the Burrow with Rufus Scrimgeour.
They do, however, make fun of him a lot because Percy is estranged from the Weasley family at that time due to his loyalty to the Ministry of Magic over his family. The confrontational atmosphere when Percy and Scrimgeour visit the Burrow on Christmas Day adds tension, but it doesn’t involve any physical altercation with things being thrown at Percy.