Sure, he could have just posted it on his Facebook page and promoted the heck out of it on Twitter, but why do that when you can make a viral video and get everyone talking about it?
The only tricky part is that making a viral video means you have to come up with something epic, because speaking for the collective internet, we have very high viral video standards. Arnold pulled it off, though.
First, he went out on the streets of Hollywood dressed as The Terminator and took some pics with tourists, scared some people and even met his doppelganger, who he had an "I'll be back"-off with.
The best part was when he went inside Madame Tussauds museum and scared the s**t out of people who thought they were posing with the wax figure. Thanks, Arnold...Now we are forever afraid to go into any wax museum! And those people? They probably WON'T be back!