The worst sound in the world to a working seaplane pilot is: Klunk...Splash. That's usually followed quickly by a rather loud "Shit!".
When I was working in Kodiak, I'd gotten a new shoulder holster for my government issued handgun, and not having used shoulder holsters before, didn't realize I needed to adjust the friction screw to hold the
pistol securely.
Late one Saturday afternoon, I landed at Lilly Lake, the municipal seaplane base in Kodiak, and it was a little windy. Getting the Cub into it's slip, I quickly jumped out of the plane, bent over to grab a line to dock the plane, and.....Klunk, Splash......Shit! My government issued gun just went for a swim in water that's about five feet deep.
Several years before, one of my bosses lost a government handgun he'd left in his truck overnight. Someone had broken into the truck and stole the gun. I witnessed the process he went through after this loss was reported, which convinced me that I was NEVER going to lose a government gun.
So, I went home and Sunday morning I returned to the lake with my snorkeling gear. After rooting around in the slime and muck on the bottom of the lake, I actually found the thing.....

I took it home and cleaned and oiled it thoroughly, and drank a few celebratory beers.
The next day, Monday, the Kodiak Daily Fish Wrapper and Litter Box Liner (yes, that was the actual name of the daily newspaper) had a front page article, complete with large font headline reading "City Engineer Reveals That Lilly Lake Condos Have Been Dumping Sewage Into Lilly Lake for as Much as Four Months". Turns out the condos had a broken sewage line.....and....
My float slip was located right across the (narrow) pond from the condos. I took about seven showers that day, then went to the doc and got a new tetanus shot.......and drank a few more beers.
I think the beers prevented infection.
I've given a lot of swimming lessons to stuff I used to own.....
MTV