Paper Balls Fun This one's been tried and tested by my darling sister, so I'll give it full marks when it comes to irritating me. Each time your sister opens her mouth to yawn, talk, or sing; aim a paper ball into her mouth and scream 'basket'. I know, you got to be extra vigilant to pull off this prank but you can be guaranteed of some serious fun. Mouse Problems Your sister cannot live without her personal computer, eh? This will keep her away at least for a few hours. Change the mouse settings and if you have a joystick handy, you can well, use it instead of the mouse. It will be some time before she gets the hang of the joystick, and might even be perplexed to use it. Salted Juice I remember playing this on my sister-in-law, and the reaction was fantabulous. Add a dash of salt to your sister's glass of soft drink/juice and innocently serve it to her. Well, be prepared to be assaulted with some curses and beatings if she gulps down the juice in the morning. Assignment Spill Your sister has to submit a really important assignment and she has it completed and resting on her desk. Here's what you got to do, make a copy of her project, then spill some ink or coffee on it. Hide her original copy safely and just before she breaks into tears hand her the original one. Fragile Gift This one should take the prize, if nothing else. Take a huge box and decorate it really well. Place a smaller box inside this box, and yet another small box inside the second one. You can repeat this a few more times if you wish to. Ultimately in the smallest box, carefully wrap a painted stone. Do not forget to fill it with newspaper to serve as a padding. And yes, do not forget to label the gift as fragile. Watch her reaction and have a good laugh. Photoshopped Horror Coax your sister to pose for some real good portraits. Then with the help of Photoshop work on her best photograph and submit the work of art on a networking site. Tag her along with some of her close friends and have a blast laughing at her expense. Hate/Love Letter Find out the person who your sister really despises. Then write a really long letter and post it to your address. When she receives it she would look bewildered to see the annoying name there. Another way is to send her a bouquet and a box of chocolates from the person she really hates. Newspaper Ad What you can do is place an advertisement for the sale of some old wooden furniture and give your sister's name and contact number. Your sister's cell phone will keep ringing throughout the day and you can have a great time watching her explain to the callers that she had not posted any advertisement and has no items for sale! Hell with Alarms Who likes the sound of irritating alarms going off when you are happily dreaming. Not me at least. This is exactly what you got to do. Wait for your sister to fall asleep. Once she is safely in her world of dreams, fast forward her alarm clock, say, if it is 11pm change it to 3am. Watch her reaction and have a hearty laugh when she gets up to turn off the alarm. Head Splitting Music If possible get your hands on a huge speaker/amplifier with woofers. Plug in your guitar, remember to meddle with the tuning of the guitar so it sounds really bad. Place the speaker close to her bed, and strum away to glory. She is sure to wake up to a noisy start. Then the rest will be history.