Occasionally you'll run into instructions for a few glitches for your favorite games (typically NES games) that require you to do something that your operations manual (you totally read that, right?) expressly told you not to do: to partially remove the cartridge from the system while it's powered on. I don't like these glitches for a number of reasons.

First, removing (or inserting, for that matter) a cartridge while your system is on has the potential to damage your system, your cartridge, or both (admittedly kind of rare, but still possible). Consoles typically aren't designed for hot-swapping.

Secondly, the results are completely unpredictable. Most of the time you're just going to freeze the game and that'll be the end of it, but occasionally something will happen. Your character will gain superpowers or (more likely) your inventory of special items will be completely scrambled. And, if you can continue, you're going to have lots of in-game stuff to play around with... maybe. Which will be great, until you try to do the trick again which brings me to:

Thirdly, the trick is nigh unrepeatable. Since you're working with trying to get a moderately complex program to glitch out by partially removing it from its system while it's running, there's almost no chance that you can repeat the glitch with any kind of regularity. I'm sure that minutes after this goes live I'm going to get inundated with emails telling me how wrong I am, but the point stands. The effects are essentially random.

So, potential hardware damage combined with unreliable and unrepeatable results? Yeah, I'll stick to programming errors and easter eggs, thanks.