... when you click-drag an ultra-rare ship to your bank to free up your inventory only to see the game registering it as a double click and thus opening the box for you, binding the ship to your character.
... when you believe Cryptic has given up any hope of revitalizing the usefulness of the Assault Cruiser, so you purchase an Odyssey -- only to find out not too much later there's going to be a Fleet Assault Cruiser variant which has the performance you want, but you're skeptical about going with it since you just dropped a bunch of C-points for the 3-pack Odyssey bundle and don't want to think you wasted your money.
... when it's late-o-clock in the morning and you've been grinding STFs for hours on end and when you get a rare tech drop you want, you accidently buy the wrong set item, thus negating the last several hours (or few days) gaining the EDCs to buy what you wanted.
... when you've been buying Large Hypos at an inflated rate on the exchange, not realizing there's a Large Hypo vendor on DS9.
... when you decide to go to a different starbase to change your costume and pick Starbase 39 since it usually doesn't have a lot of people -- only to recognize upon zoning in there is no costume tailor there.
... when you forget to add a zero to an expensive merchandise item on the exchange and end up selling it for a fraction of what it normally sells for.
... when you forget to put impulse engines on a vessel you take out of mothballs and spend the next 15 minutes using your reaction thrusters to scootch towards the starbase to beam back in.
... when you've been doing elite STFs all night and your gut tells you this team is made up entirely of idiots that don't know what their doing -- but you end up succeeding and the hiccup at the beginning that led to the feeling was just that... a hiccup.
... when you respond to the Ten Forward thread 'The person above you' only to find out someone ninja'd the person you were responding to, thus disrupting the entire thread game, and then editing your post to reflect the person who you now have to respond to -- then having to edit again when he responds to your edit (it turns out you were both constantly monitoring the thread).
... you are responsible for 80% of the kills in an Elite STF only to see the idiot who was trying to ruin everything end up with the Prototype Borg Deflector Tech you have been needing for weeks.
I'll also add as a footnote: "The rainbow cruiser with crappy consoles and boff powers that refuses to participate with the team (by supplying heals or even attacking the same targets) ends up getting the Prototype Tech."
In the same vein as your post, only this guy really wasn't trying to ruin it on purpose, he was just that daft.
After you accidentially que for an elite ground STF, battle for an hour with common gear to get to the final room and discover how to win the battle, you look around to find the rest of the team has bailed on you.