Christianity and extreme, seizure-like bodily shaking

I've noticed here and there the odd practice of inducing an **extreme, seizure-like bodily shaking** in oneself, which seems quite strange to me; it's not at all clear what the purpose is. Some people claim that it may have come from the Quakers, although Pentecostal's do it, and it occurs when the Holy Spirit fills the body . It also seems to be encouraged in some Evangelical circles, as it was explicitly said to be the force of the holy spirit in the movie *Jesus Camp* (2006). ## **What exactly is this practice called, and where did it come from?** I don't recall reading anything about it in the Bible. If you require an example, since I don't know what it's called I'm unable to find videos of it successfully on Google ("christian shaking" doesn't quite work), but what reminded me of it was the [few seconds of this clip](http://youtu.be/bFEoMO0pc7k?t=1m14s) of one of the "Sweet Brown" remixes.