I hit an inside the park homer with Fernando Valenzula the other day. It was vs the computer but still is pretty rare.
Dude, against the computer, you get inside-the-park jobs with the pitcher all the time. They hit the ball so slow that, if the wrong fielder gets locked onto it, a lot of the time you'll see things like the shortstop or the pitcher chasing a slow roller all the way to the outfield wall, by which time you've already scored.
If you bunt with a three-quarters swing with a right-handed pitcher, you can also make this happen fairly often, even with nobody on base or anything.