After the discussion about passion and interviewing testers I started to rethink how I conduct interviews and I think that in the future I will use MS Paint as an application to see how candidates approach testing.
A long time ago, I wrote my own little app for use during interviews. You can play with it if you like - it has many deliberately injected bugs - so no raising defect reports with me, but feel free to share any experiences that you have with it.
I mainly used this in team based exercises, and primarily to explore presupposition analysis as a method for testing.
So, now to explain the reasons why, and how, I'll use MS Paint.