I've got two recent "did I ruin it" stories to share - my most recent two batches!
The first week of April I bottled up an experimental ale. It was at a time I was really hurting for bottle donations, and without realizing I ran out of bottles about 3/4 of the way through a 23L batch. I drove down to my local HBS for help and ended up buying a wide-diameter cap press and caps so I could use empty champagne bottles the missus had from a party a few days prior. Saved! In they went and to the closet for aging. I crack one open 3 weeks later. Plenty of head, beautiful colour... but something was wrong. The head was overly-metallic, the brew tasted off. Soapy. I dumped it and tried another from a longneck. Same taste. My heart sunk! Whatever I did, I must have ruined the batch. Or so I thought. I gave it another couple of weeks and gave some to the boys at work. They reckoned it tasted great! What the...? Then I give one to a friend of the missus. "Fabulous, tastes like a Fat Yak lite. How'd you manage it?" he says. So I pour a glass. Looks about the same as before, but this time the smell of hops and slight floral notes have replaced the "bag of coins" aroma. Mouthfeel is good. Finish ain't bad either. I'm keeping this one in the closet for another month or two at least after realizing I was panicking and not letting the beer do its thing.
The most recent batch was started one month ago. After two weeks of the FG not where I thought it should be and a holiday coming up fast, I decided to leave it sit in the primary until I got back. It was only until today that I thought I should check on it. I opened it up to take a gravity reading and there was a thin white film over the top of the wort, the beautiful aroma that used to permeate from the surface had been replaced by a musty, almost stale aroma. Guess what? My heart sank again, thinking "infection is one of the few reasons to dump." But this was a Munton's Gold kit and I'm a tightarse, so something in me decided to give it a taste test. I poured an ounce into my snifter and looked at it. Crystal clear with a beautiful deep brown hue, simply beautiful. The smell and taste weren't as... satisfying as when I last checked on it but it still tasted pretty good without any clear off taste or sour notes. I figured, maybe it's just a surface film and hasn't penetrated the wort deep. So I say screw it and start bottling, tasting a bit after every 3-4L with still no change. I stopped bottling just before the surface got too close to the spigot. Something tells me this beer is going to surprise me just as the last one did. Just gotta let the yeasties do their thing and trust them.
Never ending +1s to Revvy for his timeless advice, it hasn't steered me wrong!