For what it's worth in anectodal evidence weight, the last time I filled out the form, I jokingly asked the counter guy whether anyone ever checked yes to some of the more obvious boxes -- getting put in the booby hatch, etc.
And he said, yes, he's had people check those boxes... and then get politely told they wouldn't be buying a handgun from him.
And he said, yes, he's had people check those boxes... and then get politely told they wouldn't be buying a handgun from him.