In an interview once, I asked if I could look at their bug tracking log. (They wouldn't let me.)

So I asked how many bugs where in their bug backlog. (They wouldn't tell me.)

So I asked something along the lines of "in the last year, have the number of open bugs gone up or down?" (They wouldn't tell me.)

I stopped the interview a while later (for other reasons) and told them I didn't think I would be a good fit.