People's reaction to spiders are commonly primal: scream and run or scream and kill. Thankfully, I have never encountered (and God please may I never) spiders of such an awesome specimen as this (read the comments, it is worth your time). I would probably just stare at it and just ... stare. However, if I were this guy, I may adopt a different approach.
Perhaps along the lines buying an airline ticket and getting the hell out of Dodge. Or Japan as it seems.