(My boyfriend and I are cuddling. I’m holding on to him while he’s trying to get up to get to class, and I’m whining and not letting go.)

Me: “No!” *force cuddling*

Him: *poking me randomly* “SECTUMSEMPRA!”

Me: *jumps away* “What?” *laughs*

Him: *laughing too hard* “I just wanted you to let me go.”

Related
(from NotAlwaysRight):
Totally, Like, Aguamenti
Totally, Like, Excruciatus