The most reckless/foolish thing you have ever done?

[Walruss]

Cruising around in a type IX for the first time, in the warm south Atlantic. Come across a British convoy escorted by 4 flower class corvettes. Anxious to try out my new big gun, and feeling blood thirsty, I snuck up on the rear of the convoy, surfaced about 4,000 meters from the rear escort, and engage.
My first (fluke) shell crashed through his bridge, the second took out his props and the third blew up his rear battery. By this point, the others had turned around and were rushing to get my attention so I dived, dodged their attentions for an hour or so and they gave up.

Feeling cheeky, I circled around and did it again. To the Front escort. Charged straight at him, ahead flank, presenting as narrow a profile as I could and engaging again out to about 4,500 meters or so. Crash dive at 1,000 by which time his poor little boat was literally digging into the water from severe flooding at her fore, and the other two corvettes were REALLY pissed off.

2 hours later, they give up, and I surface to see a lot of debris and a few scattered lifeboats from the last corvette.

I proceeded to eliminate the final two corvettes in almost the same fashion, and then chew up my entire torpedo load gutting the convoy before I decided I'd had enough fun.

Damage: 1 crewman injured, 1 dead, a small hole in the bridge and some scratched paintwork.

I don't know who taught those brits to shoot. They didn't do a very good job :P

This was GWX as well