this trick can make you very vonerable to be killed early on if you do this early, note: this works best if de early, here are the steps (a trick even newbies can use haha) #1 make a pylon close but out of the sight of the enemys probes or he will see it and destroy your pylon, #2 make about... 2-3 cannons out of his sight range to, now you can advance to his sight, make one cannon in his sight so he sends some of his units to come and stop the cannon he/she sees he will get a suprize when he sees you hve some farther back, #3 as soon as the first cannon finishes make about 2 more even farther up on his command center/nexus/hatchery to kill the rest of his probes/SCV's/drones, (tip: this can have even better effects if the one you do this to is also protoss because he might thing thats his builing (for some wierd reason) this works, but can make you easly die on most early attacks.

CreepColony's Opinion: This can be done on maps that you know very well. You must also be very careful that your opponent does not see what you are doing.