It depends on the sign. If I just asked for a sign, and then came upon a stop sign as I was driving, I wouldn't really accept that as much. If I asked for a lightning strike on a stormy night, I wouldn't accept that as much of a sign either. If I asked for something more specific and unpredictable, like the Northern Lights to appear in an area they rarely do, that would be more impressive. If, as I was driving home, I asked for the sign to be a message on my voicemail from phone number 604-528-5935 that was a wrong number and the person was looking for Jason, well, that would be mighty impressive if that occurred. And if I do get home today to find a message from that number asking for Jason, I guarantee you it would cause me to do some heavy questioning and soul-searching regarding my beliefs.