How designers spoiled your day?

I'm focusing my studies in user centred design; my future career will probably involve testing such infuriating objects daily. I fully expect to be bald, dangerously underweight and a chain smoker within three years of professional designing.

Ideally you don't want to be testing the things you've designed, and great testers aren't usually great designers and vice versa, but it all helps :)

Make lots of stuff, whatever you do, and good luck!