Haha, the push-the-truck thing, I remember that. It sounded plausible and I was way excited to get Mew because I never owned a gameshark or a trading cable...
It turns out that there really is a way to get Mew in Red/Blue. No BS, I've tested this myself and it works. You have to get to Lavender Town though.
http://pokeglitch.tripod.com/id1.html
If only I had known this back in those days...
