What is the most stupid thing you ever done in chess?

Botez gambit

Moved the king when I could just take the piece that checked me.

Trying the bongcloud opening

I started playing chess ;-)

Closing my phone when i was playing and forgot that i was playing chess

Resigned a winning position. No joke, this really happened.

I resigned in this position. 22...Qg6+ wins outright as now e8 is covered and on the next move, I take the Queen.

But no, I went 22...1-0?? - yes, the BLUNDER WAS RESIGNING!

Underestimating my opponent

I lost and threw my phone against the wall, which shattered it. I bought a replacement for $150 a few days later and will take better care of it 🤠

I found a line to trade queens, then forgot to play my move!

Sacrificed my Queen thinking it was a checkmate until I realized she could it it with rook 😭

Trying to emulate tal playstyle.

Travelled halfway across the country to play in a tournament, stayed up all night playing cards, overslept, and missed the morning round.