As long as you didnt ask "when are the beatles kids joining you and Paul/Ringo for a reunion" you'd be fine.
I'd like to ask Ringo 'what does he think is his best solo release and what was one was the most fun to make?'. I figure if i asked a non beatle question he might like me and not walk off shaking his head and cursing under his breath. Plus its not a question you see him get asked very often.
Paul seems to have been asked everything, so on thought i'd ask the same as above. And then whack him with ...