#75 Call Waiting
I used to work at a call center which employed a dialing program. I figured out that if you hit a series of functions on the dialer in the correct order, it would freeze up the program and you’d have to restart your computer, which took about a half hour.
I did it a couple of times to get some free time at work, but others caught on and the company eventually fixed the program with an update.
Credit: Clownaround