Can't say I've had a big buck walk up to me like that, but I have had does walk up to within 5 yards. Its almost comical to watch them try to figure out what they're looking at...craning their neck, looking away then quickly looking back at you, stomping... I suppose I passed as a rock or something one time, after trying to bust me for like 10 minutes, she just slowly walked away, totally un-spooked.