The Harry Kane Curse is associated to Bayern Munich's Harry Kane, previously Tottenham Hotspurs own, before he got traded after 19 years with the Spurs. The Harry Kane Curse is what it's called since the Spurs failed to win the league for 19 years whilst Kane was on the team. Also, since he played for England, he is known for bottling England's progression to later stages in various competitions.
Person 1: Yo, Tottenham are first in the league now since Kaneleft!
Person 2: So The Harry Kane Curse is real after all...
Leaving the girl you have a crush on to your best friend for instead being able to make out with his sister.
A: "Did your hear that John is now dating Ryan's sister?"
B: "Well, Ryan is in a relationship with the girl John had a crush on, so I assume John was doing a Harry Potter."