Biggest scares you've had as a fish keeper?

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Hearing a weird popping noise and then smelling smoke because my 10g decided to leak and somehow the water managed to get to the powerstrip which was shorting out outlet by outlet.

Accidentally somehow mixing an Ambien in with a bag of new ceramic media I was putting in a HOB filter.
 
My bearded dragon (smaug) was loose, and decided to run behind my 30g salt water tank. I quickly pulled him out and went on with my day. Returned later to find my tank sitting at 105 degrees. Turns out while he was back there, he had pulled out the heat sensor for my heater, so it just kept heating. Thankfully, everything recovered.
 
I came home to the 19th-floor condo in which I lived at the time (in the 1980's) to find my new 100-gallon aquarium had split a seam and lost about 80 gallons of water...which had somehow vanished. The wood parquet was damp, no standing water...everything had found its way through some gap or crack in the poured concrete. Never heard a word from neighbours or from management; that water just seemed to disappear. I still have mental images of somebody in that building drilling a hole in their ceiling to hang a plant hook and having 80-gallons of water come pouring mysteriously out...

And, in the 90's, one of my favourite fish was a large-ish electric catfish, maybe around 12-14 inches. He spent all his time sitting like a giant inert lump of snot in his 120-gallon home, rarely moved unless to feed, but I had owned him (her?) for years and I liked him. One day I was working in the tank, as I often had in the past, but I got careless and cocky and didn't keep watch. He moved towards me and gave me a little love-zap...which so startled me that I involuntarily yanked my arm back and out of the tank, smashing my arm on the tank stand, chipping a bone in my elbow, shattering a glass cover leaning there and slicing my arm to the tune of over a dozen stitches. Not so much scary, more of a reminder to stay alert and to avoid complacency.

The scariest? No contest: I once received a phone call from my wife telling me that she had found a snake that had escaped its container and was loose in the house. This had happened a few times in the past, and the escapee had always been a hatchling kingsnake or cornsnake (I used to breed snakes). A small, colourful, docile 15-inch snake did not phase my wife; but this time the fugitive was an adult bullsnake, well over 6 feet in length, coiled on the floor in the centre of the living room, hissing and striking as only a bullsnake can. She discovered it while vacuuming...in the nude!

The scary part was coming home that day...:)
 
Catfish, not eel...but the operative word was "electric".

I had an electric eel as well, but treated it with much more respect than the catfish. The eel was indeed a scary fish.
 
Another one I had, not fish related, was going to feed my crested gecko at night, and realizing that the cage door was open, from the previous night. No gecko to be seen. Scariest and most sleepless two weeks of my entire petkeeping life. Thankfully I eventually found her.
 
lived in a condo townhouse had a 135g bust a seam overnight - thankfully 10” fahaka still had enough water to survive in -

neighbor kid got blamed by his parents for overflowing the toilet - i was 20 something...

no real damage was laminate flooring on a slab -
 
I built this huge tank, 7 feet x 2 feet base and 3.5 feet tall and I hadn't had done a good job with silicon or one side glass wasn't properly flat or something.

This tank was on a second floor, in front of stairs, a side came out all loose, all water running down stairs in my house, my fish came out floating in that water. I was frozen, my brother who is 2 years younger than me ran inside bathroom and got a bucket for the fish and picked him.
 
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