This is one of the best cheats out there. It allows you to make your probes invincible to melee attacks and only vulnerable to ranged attacks if done correctly.
Basically when you go to make an assimilator with a probe, then right when it starts making, and you click to the other side, you can actually go through it, and if you press S (stop) in middle of it, you can cancel the assimilator (or not), and you get stuck there and only a ranged unit can kill you. I made a video showing this bug. I think it may be useful for scouting if you have zealots/lings on your back. Also, as a bonus feature, sometimes, when you place the probe right, enemy workers will have to go all the way around the refinery to pick up gas, as shown in the video. (haven't figured out what's the "correct" placement yet)
[youtube]http://www.youtube.com/watch?v=yiUB41_K4U0&feature=player_embedded[/youtube]
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awesome