What’s your favorite way to break your own AI prototypes before shipping?

Quick question for the builders here. It's so easy to get excited when an AI-coded app handles basic demos smoothly but the real test happens the second a user uploads something weird heavy or completely unexpected.

I learned this the hard way when my clean little converter exploded on a dense document. Now I try to test with the worst possible inputs on day one.

How do you guys stress test your MVPs to catch layout or processing failures early?

Drop your methods below!