A Job Interview... "What is your biggest weakness? What is your biggest strength?"

A Job Interview... "What is your biggest weakness? What is your biggest strength?"

In my job interview, the interviewer told me I had done very well, and he had two final questions for me...
1) what is your biggest weakness?
2)what is your biggest strength?
I said "Well my biggest weakness is that i have trouble discerning between real life and fantasy"
The interview said "okay then, and what is your biggest strength then?"
I replied " Hmm, either that I can fly, or that I can turn invisible."