i cant find any machines that this works on lol

You CANT get in trouble for it.

Its used to gain information about the machine like how much has been put into the machine etc. If a machine has not been set you can change the switches inside to set different prices of drinks etc which you CAN get in trouble for.

Pm me for info on coke machine hacking, i know alot about it. ;]

Ahh I was so excited when I saw this awhile ago, though it is a cool trick

do you do it to the first 4 buttons or repeat the pattern?

Just pres 4 2 3 1. and then you should get a menu come up

You can break off the plastic panel and stick your arm into the machine and grab a drink.
Did it all the time at my old school, got suspended for 3 day's when I got caught. and they confiscated the like 50 drinks I had hid in my locker.

Loool also the risk of getting your hand snagged inside the machine.

get caught doing it just run lol
not tryed it yet, probably wouldnt remember if i am out though.

Quite useless though, although it's interesting, you can't really do anything worthwhile with it.

I never got stuck. :D
My friend did for about 3 minutes while I was pulling on his arm to get it out because he had stuck it up there in the wrong place.
Oh, and you can also run into the machine and hit it with your shoulder and a drink will usually pop out. :p