What is the best harry potter joke/riddle you have heard?

I will not skip to the headmaster's office cantar 'we're off to see the wizard' ... lol

...or... this one...

I have one it's not actually a real joke:
"I will not make jokes about Lupin and 'his time of the month'"

My magic brings Voldemort to the yard, and I'm like "thats hurtin' my scar."

Knock knock.
Whos there?
You know.
You know who?
Thats right. AVADA KEDAVRA

Knock knock.
Whos there?
You know.
You know who?
He's dead, you can say his name now.

Harry: Yes.
Snape: Yes sir.
Harry: Theres no need to call me sir, professor.

Five mais points from Gryffindor for being an insufferable know-it-all

Oh, very good....Yes, it is easy to see that nearly six years of magical education have not been wasted on you, Potter. 'Ghosts are transparent

Your head is not allowed in Hogsmeade. No part of your body has permission to be in Hogsmeade

Discipline your mind!