Another one of those stupid moves

 As always seems the case, once you uncover one 'stupid' move, it starts appearing more often.

Below, with Black to play, my first thoughts were drawn to 

1) trapping the white Rook, 

2) capturing the pawn on c5, 

3) exploiting the fork on c4 ( Rook check forking Bc1, after capturing c3 ) 

and finally to the correct solution, pausing briefly after seeing white's riposte to the first move, and knowing how to respond.

Black to play

Maybe, one of these days, I will have an opportunity to use see and use this is a real OTB game !