Quote from: One Horse Town;276715I did the same, except with a fireball in a crowded corridor.

hehehe...I think that this is one of those shared noob experiences with AD&D.  I think that almost everyone playing a magic-user did something similar; either with lightning bolt, fireball, cloudkill, etc.

Playing Hollow Earth Expedition, and my character has no fighting/combat skills, and is allowed to drink magic elixir once during a scene to give her some combat advantage.  

She wakes up from an old groggy elixir moment to find herself on a air ship, where she can hear gun battle and everyone screaming from a distance.  Trying to find out what is going on, she runs to the cockpit to ask question and finds it empty.  In a panic, she decides to steer the ship (with no flight experience), and ends up tossing about 3 of her party members off the outer haul.  

Luckily there were some who obtained jet packs, that allowed them to be saved, and our Nazi enemies temporarily put out of commission, but they won't let my character go any where alone anymore.

I was playing an alcoholic diviner with chip on his shoulder. I had charmed the captain of a pirate ship into giving us passage to a foreign city we needed to visit, but the first mate knew something was up and started trying to bully my diviner. I ended up using Mage Hand to knock his hat into the water and he freaked out and started trying to wail on me.

I asked the DM if he was doing real damage or subdual: We had a houserule about fist-fights involving a reverse-subdual attack where in exchange for a -4 to hit a fist could deal lethal damage. The DM says it's real damage, so I treat it as the guy trying to kill me, and I cast scorching ray on him, which was my big takedown spell at the time (I was about level 4 IIRC). He ends up surviving, the rest of the pirates turn on us, the other PCs jump in to get my back, and a TPK results.

Not so much 'oops' in play as an oops of belated insight about character creation choices.

One of my friends decided that she wanted to run a supers game where anything goes. This has led to a great deal of laid-back wackiness, including an annoyingly overpowered NPC who told me not to worry about receiving his aid and to enjoy the taste of Sprite (tm).

My character was essentially an MMA fighter that had been partially fused with a unknowably powerful and not-at-all benign but relatively passive supernatural/demonic entity that granted him powers over time and space. My oops moment came after I'd dome some research and I realized that I'd inadvertently made an avatar of Yog-Sothoth...

"...from a vantage point at the far side of the room."

I spoke the phrase too little, too late as an addendum to:

"I read the glowing runes."