An "Oh Crap" moment? Hah, oh if I had a dollar for every one of those. Well, since programs are being spoken of here, it jogged my memory of all the times I tried making an SRB2 map on the not-so-good ol' Doom Builder. I can't count the times or the amount of frustration I've gained when I was working on something worth while, only to have it crash and save nothing. I particularly remember creating a very cool arena-esque map that I spent a good two or three hours on, only to add one more line segment before DB gave me a heart warming pop-up and shut down without saving a bit of it. Last time I ever used it to make anything. Thankfully, I found the life saving goddess that was the SRB2 Doom Builder 2.0 (Community Build).
Oh Crap Moments:
1) The moment when you fart in an indoor assembly and everyone knows that it's you...
Yeah, that happened once and my friends would never stop taking the mick. Even though they've done it themselves tons of times.
2) The moment that you think you've won a 'CTF' match in a "vehicle shooting game" (Fired Up - PSP multiplayer game, the multiplayer is extremely addictive whereas the single player is the opposite) only to be blown up by a hidden opponent with a railgun or a "super-overpowered-supersaiyan-godmod-instantkill-LASER" in your base.
---Status: "I'm betting everything on it!"---
Fun Fact: I actually dislike cats :]
My "Oh crap" moment was when I was in a middle of a game of Capture The Flag in Team Fortress 2 [I had to use a public library computer because I don't have one of my own. I'm currently using one.], and this game was over 40 minutes long. I had like over 120 points at the time, and the game was about to go into Stalement about 30 seconds in. Someone asked me to trade my Strange Force-A-Nature for some Strange Hat [I forgot what the hat was called.], By the time we were about to accept the trade, my computer crashes and The Blue Screen of Death shows up. I was so mad at that time, because all of my progress and my killing streak on that game all disappeared. Not only that, but I had to reinstall the game, and Steam again! I was like "Oh, Purrfect. Just Purrfect!"