The rapture, as you likely know, is a Christian theological concept, based on a scripture from Thessalonians, that suggests that just prior to the second coming of Christ, the faithful of the church will be taken up bodily into heaven. (Actually, into "the sky," according to the text of the epistle.) It's the basis of the wildly best-selling "Left Behind" series of books.
Here is a short film, created I assume by a church somewhere, to visualize what the rapture might feel like. It's acually pretty well done.
This, on the other hand, is a more sacreligeous take on the concept, taken from HBO's "Six Feet Under":