Ever since Siri's been out, I've seen people comment about how great it would be to replace Siri's voice with J.A.R.V.I.S. from Marvel's Iron Man series.
Apparently, that desire hasn't waned, as there's a fairly large thread on Reddit discussing a method for replacing Siri's stock sound effects with custom Jarvis effects pulled right from the movies.
I've tried this method out, and honestly, it sounds a little bit low budget. Nonetheless, I know some of you will enjoy this, and just the fact that you can learn where the Siri sound effects are, and how to replace them properly, makes this tutorial worth checking out.