So, every once in a while I'll download a map I don't really want to launch Half-Life to see, so I'll open it up in BSPViewer to check it out. And then, after a couple minutes of roaming around, I'll inevitably start to feel nauseous. This is especially noticeable when I have the viewport stretched out really wide (which it is by default, since I have a widescreen monitor), but it really could happen any time at all.
Now obviously, there's nothing anyone could do about this, I was just wondering if anybody else experienced this strange occurrence?