My biggest mistake was dropping half of an OC 40 into the garbage.
I had just split it and chewed the other 1/2, then i was wrapping the other 1/2 up in tinfoil, and i took too much tin foil, so I ripped off the excess foil and thew it in the garbage. At the time I was talking to my girlfriend so i wasn't paying much atttention. So I felt something in my hand, opened it, and seen that it was tin foil. But, stupid me, I thought that this was more excess tin foil, when it was really the pill. As soon as I walked away from the garbage I had realized what I had done. Of course I open the garbage to find ONLY the scrap tin foil sitting perfectly on the top, and my pill nowhere in sight (figures).
To answer the question that a lot of you probably have in your head right now:
Yes. I did it.
I rummaged through that garbage, carefully inspecting every single piece before placing it in another bag. It took about 30 mins, but eventually I found it sticking out of SPAGHETTI SAUCE in the bottom of the bag. How it got that far down, I don't know. But man that was some BULLSHIT!
The only other common mistakes I've done is dropping the cut up weed or slightly breathing out through a straw and blowing away a line..