*May give hints, or spoilers to the books/movies*
(sad, Not from the books)
Every year when it’s Colin Creevey’s birthday, Harry signs his own picture and puts it by Colin’s grave.
No one tells Harry he looks like his father at 22 because, his father never lived to that age.
Minerva McGonagall's hatstall lasted 5 ¹/² minutes, before being sorted into Gryffindor over Ravenclaw. (this isn't sad but still cool)
George gave his wand to his son and kept Fred's wand as his own...
Draco Malfoy attended Fred Weasley's funeral.
Sirius's last thought in that split second between life and death was, "Here I come, Prongs."
When Sirius was imprisoned for 150 moons, he felt bad that he wasn't there to help out Remus.
When Snape said "Look at me" in his last moments he wanted to see Harry's eyes which were Lily's (The one Snape loved)
Anyone want to add?