Rasputin's Revenge
A mean prank for which you will need the following items: A sleeping girlfriend or friend, an apple carved into a little jack-o-lantern complete with a lit birthday candle inside, and a glass of icewater. Hang the scary apple-lantern from a string in front of the sleeper's face, dip your hand in the icewater until it's very cold, and then cover their mouth with your icy hand. They will instantly wake up and see a red glowing head in their face and attempt to scream, only to be muffled by an icy, dead hand.
"My girlfriend would not have sex with me last night, so later I pulled the old Rasputin's Revenge"