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1. Swap the number of their partner and their mum in the phonebook of their mobile, embarrasing and potential devastating, but well worth it!
2. Order a taxi from every single local taxi company to their house, all with their name... I advise using a new sim card! Depending on how serious you are, prostitutes can be used too!!
3. Take their iPhone/iPod Touch and move every single application to another page, takes ages to get sorted!
4. Lean a bin filled with water against their door so when they open it all chaos breaks out! (Perfect for the summer)
5. Coat their soap in clear nail varnish so when they rub it doesn't create any suds!
6. Hide an alarm or two within their bedroom and set them to 3am, set their phone alarm for good measure.
7. DOUBLE: Swap two of your friends TV remotes (have to be the same!), you will have them under your control for as long as you choose to keep the joke going for.
8. Find a (reasonably) important document, using the CTRL+F shortcut, replace their name/the name of whatever is important about the document with the word bellend or douche etc.
9. If they have a bluetooth laptop or you can grab a spare bluetooth dongle, setup a wireless keyboard and have fun using the 'Play music' and 'Shutdown/Restart' functions. Holding down Flag+E is popular too.
10. Find a nice moist dog poo, place it in a plastic bag, wrap the bag so it is almost bursting, and leave under the handle of their car!
2. Order a taxi from every single local taxi company to their house, all with their name... I advise using a new sim card! Depending on how serious you are, prostitutes can be used too!!
3. Take their iPhone/iPod Touch and move every single application to another page, takes ages to get sorted!
4. Lean a bin filled with water against their door so when they open it all chaos breaks out! (Perfect for the summer)
5. Coat their soap in clear nail varnish so when they rub it doesn't create any suds!
6. Hide an alarm or two within their bedroom and set them to 3am, set their phone alarm for good measure.
7. DOUBLE: Swap two of your friends TV remotes (have to be the same!), you will have them under your control for as long as you choose to keep the joke going for.
8. Find a (reasonably) important document, using the CTRL+F shortcut, replace their name/the name of whatever is important about the document with the word bellend or douche etc.
9. If they have a bluetooth laptop or you can grab a spare bluetooth dongle, setup a wireless keyboard and have fun using the 'Play music' and 'Shutdown/Restart' functions. Holding down Flag+E is popular too.
10. Find a nice moist dog poo, place it in a plastic bag, wrap the bag so it is almost bursting, and leave under the handle of their car!
Also works with potential girlfriends and urself. 
Yup, good, aren't they? 