"Do you have any weaknesses?" "Yes, I hate stupid interview questions"
I think I actually found a decent answer to this question. "I value stability so much that it sometimes acts against my best interests. For example, if I hadn't been laid off from my last job, I would've preferred to stay there as long as possible, even if it meant not looking for better jobs. The stability of an existing salaried position was too attractive to voluntarily let go."
Paraphrased, "Yeah, my weakness is that if you hire me, I'd like to work here until I die." Hey, I got the job.