Come on now, try to think for one second..
I can think of hundreds...
"Did you work on a classified government project?"
"Did you work on a innovative technology project?"
"Did you program a (insert whatever you want)?"
"Did you invent (insert vague tech. concept)?"
"Did you head a group working on (insert whatever you want)?"
"Did you build the world's most realistic scale model train?"

I don't know guys.. what possible question could have produced a response like that?
I see a lot of embarrassing confirmation biases on BT today.
+1 This is exactly what I wanted to comment on this situation. Ask any person that worked on classified government projects "can you comment on the classified work you did?" and they will answer what Dorian Nakamoto answered.