Blunder (23)

In the diagram below from Jussupov - Meissner (Bundesliga 2011) with Black to move it is difficult to find a move which is worse than the one that was played.

21.- Qxe4??

This is one of the moves that no one will understand since there is no route to escape for the queen if being attacked. And this can easily be done with

22.f3

1-0

.