This is based on opinion. Please don't list it on a work's trope example list.
Tear Jerker / Hocus Pocus
And that sad little "meow" he lets out just before he dies. Heart-wrenching even for people who hate cats. It could almost be like he's saying "Finally... It's over...".
Pause the movie during that scene. The grave he's on as he dies? It belongs to Emily Binx. He dies on his younger sister's grave
Emily and Thackery's parents losing both of their children in one day. What's worse is that they presumably never found out what happened to their son, and probably were contemplating the worst given the witches' tendencies.
Thackery is finally freed from his curse and is finally able to reunite with his younger sister in Heaven. However, Dani is saddened that she'll never see Thackery again, to which the latter whispers in Dani's ear that he will always be with her.