I'm hoping to recreate something similar to what you see here in this clip from A Scanner Darkly. In this scene Barris is unloading scientific 'facts' about a drug on the heavily addicted Freck. Most of what's contained here is impossible to hear, let alone understand, and it feels like a device I've seen used often in film (not sure if the device has a name). It says to the reader, here's someone who will blind you with facts and information, but don't worry because it's not essential you understand any of it. It only matters you know he knows his stuff. Bare in mind the scene in the diner goes on for much longer in the film. It's about two minutes of him talking like this. But in film this is easier to get across. The viewer has no choice but to take it as it is. They don't have the option to slow things down and digest it. I could do this in writing, to an extent, by showing the confusion of the main character who's being given all this information, and by saying things such as, He talked so fast Henrick missed half the words. But is there a risk the reader will naturally want to digest the information and get caught up trying to understand what's being said? And is this, in fact, a common technique in writing?