Unlocking the Door Magically

Okay, this isn't truely magic, but it seems to me like it is.

My friend Juan taught me this:

If you are out of range to lock/unlock your car door, if you have the type of key that is a part of the locking/unlocking mechanism (like VW and AUDI has) you can stick the key in your mouth and at the same time, hit the unlock button. And it works. Apparently it has something to do with the cavity of your mouth. (Not the cavities in your mouth, as was my first understanding of this explaination as I embarassingly responded, "Oh, well then it's a good thing I've got so many cavities!") So in other words, you could stick it in your ear, your mouth, ...ANY body cavity and this trick would work. EWWWWWW.

Have fun.