How to convert methamphetamine into Sudafed

The methodology is published in the Journal of Aprocryphal Chemistry, with this logical explanation:

Pseudoephedrine, active ingredient of Sudafed ® , has long been the most popular nasal decongestant in the United Statesdue to its effectiveness and relatively mild side effects. In recent years it has become increasingly difficult to obtain pseudoephedine in many states because of its use as a precursor for the illegal drug  - methylamphetamine (also known under various names including crystal meth, meth, ice,etc.).

While in the past many stores were able to sell pseudoephedrine, new laws in the United States have restricted sales to pharmacies, with the medicine kept behind the counter. The pharmacies require signatures and examination of government issued ID in order to purchase pseudoephedrine. Because the hours of availability of such pharmacies are often limited, it would be of great interest to have a simple synthesis of pseudoephedrine from reagents which can be more readily procured. A quick search of several neighborhoods of the UnitedStates revealed that while pseudoephedrine is difficult to obtain, N-methylamphetamine can be procured at almost any time on short notice and in quantities sufficient for synthesis of useful amounts of the desired material.

Via BoingBoing's Submitterator.