10Feeling a Bit Holey
How could we possibly leave the worst canon pun off the list? During the Battle of the Seven Potters, George Weasley has an unfortunate run-in run in with a Death Eater and had his ear blasted off. Upon his return to the Burrow, Fred rushes to his side (very obviously worried)
and his mother asks how he’s doing. He replies that he feels 'saintlike'... which confuses his friends and family for a moment until he explains:
"You see, I'm holy. Holey, Fred, geddit?"
George, that was terrible. Relieved the tension? Somewhat. But come on, even Fred knows you can do better.