How often do you do something dumb e.g misreading board, action, hand

[partygirluk]

I just held K [img]/images/graemlins/club.gif[/img] x [img]/images/graemlins/club.gif[/img]. Flop was A [img]/images/graemlins/spade.gif[/img] y [img]/images/graemlins/club.gif[/img] z [img]/images/graemlins/club.gif[/img], turn q [img]/images/graemlins/club.gif[/img]

I capped both big streets "knowing" that I had the stone nuts. This is the second time I have mistaken the 2nd nut flush for the nut flush when the flop has been twotone with an offsuit Ace.

Sometimes I will find myself in the middle of the hand with no idea of the previous action, so I'll make a "continuation bet" with air when I didn't even have the lead.

How often will you guys do something like this?