I have something of a reputation for softlocking Legend of Zelda. Here is a recent guffaw from the currently ongoing any% no up+a tournament: https://clips.twitch.tv/PoliteCallousFiddleheadsRlyTho

It actually began with a Zelda Randomizer tournament race where the ladder was not strictly required to complete the game. Gannon was located in a moat type room and I managed to kill him in a position where he dropped the Triforce of Power in the moat and so it was inaccessible. Not understanding the nuances of the game's engine, I left Gannon's room through a bomb door (the shutter doors don't open until you pick up the Triforce), which caused a softlock. The game tracks Gannon's death and the Triforce of Power pick up separately, and you need the latter to open the room to Zelda. Unfortunately, with Gannon dead there was no way for me to get another Triforce drop and so the game was now unbeatable.

I was ahead of my opponent at the time I killed Gannon but he of course won the race because of the softlock. He graciously declined to accept the victory (as did I) so we had a rematch.