I'm sure people do this all the time, but it is pretty weak. Lies and shortcuts are for softies.
Here's the thing about lying on your application: if you lie about something insignificant (like being head of the chess club) the school probably won't find out. But it was so insignificant that it didn't matter anyway. So why lie about insignificant stuff?
If you lie about something major, the chances go up that the school will find out. When I interview people I ask about things they've done. If they say research I explore that. If they say they taught blind and deaf paraplegics in Surinam to play the trumpet I'm going to want to talk about that. Then I write down all the cool things I've learned about this person, which is later reviewed by the admissions officers. If things don't jive, something's fishy. Furthermore, if you write about the kids in Surinam on your application and don't talk about that in your interview the admissions office is going to wonder, "why the hell not?"
Last, it's not unheard of for medical or dental schools to expell a student for lying on an admissions application. How bad would that suck to be halfway through year 4 and find out you weren't going to graduate because someone discovered blind and deaf paraplegic kids in Surinam never learned to play trumpet?