1. Kill Your Friend & LVL 100 Error (Duck Hunt, NES)

Yes! You can actually play as THE ducks in Duck Hunt...and this mind-blowing revelation was actually written in the manual.

Now, I know some of you are saying "Weird. I figured that out the day I got my NES because hey, it was right there in the instructions!" But there is likely a large portion of us that were either too young to read or ignored the manual all together and just wanted to shoot shit. And for those people (including myself), this was one of those "WHAT TH EHELL?! HOW IN GOD'S NAME DID I NOT KNOW THIS?!?!"

As a result, it meant that we missed out on a whole generation of pissing off our friends by making those fiendish ducks even more aggravating to kill... or easier, I guess, depending on how developed you hand-eye coordination was.

All you had to do was plug one of your controllers into the second NES port during "Single Duck" mode. So easy, yet so secret.