My favorite somewhat off topic example of this is some qualitative research I was building the software for a long time ago.

The difference between the responses and the pictures was illuminating, especially in one study in particular - you'd ask people "how do you store your lunch meat" and they say "in the fridge, in the crisper drawer, in a ziploc bag", and when you asked them to take a picture of it, it was just ripped open and tossed in anywhere.

This apparently horrified the lunch meat people ("But it'll get all crusty and dried out!", to paraphrase), which that study and ones like it are the reason lunch meat comes with disposable containers now, or is resealable, instead of just in a tear-to-open packet. Every time I go grocery shopping it's an interesting experience knowing that specific thing is in a small way a result of some of the work I did a long time ago.