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The problem with doing this, besides being incredibly unprofessional, is that it won't really affect the company much - besides reducing productivity for a little while - however it will annoy the hell out of your previous colleagues. Unless you're leaving because you fell out with your colleagues, I doubt it would have the desired effect.

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Yeah everyone would notice it around the same time, look at recent commits, see some silly file got committed and revert. You'd have to have a team of pretty sub-par devs to not undo this fairly quickly. Although it would be sort of annoying for a couple of hours. In fact if you left on really good terms and were still great friends with the team, something like this might be more of a silly prank than anything truly malicious.

Or it will teach the company to use some kind of VCS.

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