You may get extremely fast download speeds at one point in your download because a "seeder" (someone who has the complete file) may be trying to send you a rare piece of the file so that you can share with others. Seeders try to send out rarest pieces first. The more pieces you have and the more you share with others, the faster you'll be able to download. If you have cable/dsl, 90% of the time you'll be downloading at 100+ kbps.
Opps. You need to click on this button: instead of this one: Edit: Oh and before this thread gets locked or buried, am I the only one that read the OP's name as "neverfarted" at first glance.