Can you really buy investment properties with zero money down?

[Jeff Jennings]

You hear all of these people (so called Gurus, self proclaimed obviously) talking about how when they got into investing they had no money and had to come out of pocket with zero cash in order to obtain their first property. Has anyone ever ACTUALLY done this though? I mean, between hard money, private money and gap loans it would seem like it's possible, but is it really?