The only time I've ever known them to do that was during the VH1 Storytellers back in 2000 when they were promoting Crush, though weather or not that was a fan or employee asking the question I duno. (Not that I'm too bothered anyway)

But yea, if a real fan wanted to ask their own question, they'd ask them a question many of us would wana ask, like "Can you play something from These Days?!"