Earlier quoted context omitted.
I remember a report from facebook hiring, when they broke down how each person applied. It was something weird like %0.01 were hired by "walk in". Some person literally walked into FB headquarters and left with a job. I will say, if you walk into an office, you will NOT get ignored.
I got my first job by walking in. It was at a medical center, and I just asked the receptionist for the IT department. Got routed all over the med center. When I got to IT I found the telecom manager was way over worked and needed help, but had no time to search. So he interviewed and hired me on the spot. This was in 2007. I wouldn’t do that today, you won’t get past security at most places. It does happen, though.
I got my first real tech job in a similar way. I was moving into a dorm at a state university (1999 or so) and the network was not working. No one around, so I went into the unlocked networking closet, found the IP for my floors switch, realized the ports were all disabled, got them enabled and passed out static IP information by the time the dorm networking manager got there. Was also hired on the spot!