My disastrous moves

Despite the fact that I'm playing mostly correspondence chess now, usually with 2 or 3 days per move, I occasionally still make basic and catastrophic errors. Sometimes I'm simply rushing unncessarily, but other times I manage to blunder even after spending time thinking carefully about what to do. Here are a few choice ones. They're ordered from least bad (loss of two pawns following complex exchanges) to absolute disaster (obliviousness to a mate in 1).

I've saved the best til last: