TweetMail from Pakistan will most likely get x-rayed with all the Islamic fundamentalists in that part of the world, make sure the shipper knows how to pack right.
If found you'd more likely receive a seizure notice than get busted but if it worries you have it sent to you under a fictious name and when you receive it leave the package lying by the front door unopened for a couple of weeks. If anyone should ask you can claim you don't know what it is and that you were going to return it but didn't get round to it yet.