Worst "oops" moments in PBW?

[PvK]

In the one game I've lost so far in the Universe Cup PBW tournament, I had just researched level 2 minesweepers and cruisers and had just deployed my first offensive fleet equipped with a fair number of them - enough to sweep a large but not the largest minefield, and decided to risk an attack on an enemy planet with my main fleet...

BOOM

Nothing left. I thought there may have been a bug in the mine calculation, and went so far as to ask my opponent if he thought my fleet should've been vaporized by the mines.

Well, guess what? My new class of minesweepers which I had been mass-producing were in fact high-tech jam-packed mineLAYERS, which thought they were minesweepers! ARGH!

That wasn't why I lost, though.

PvK