What would be a most hilarious prank to pull?

I watch these prank videos on YouTube every-so-often. They're the pranksters, John and Nikki of the PrankstersInLove YouTube channel. Also, every now and then, I do think about pulling one of their pranks on my sister just for the funny of it, for one thing, but more importantly, so I can even have revenge on her for her torments on me as well. Which of these pranks from the PrankstersInLove should I pull on my sister?

Pick in the polls.