Yes, We ALL Make Mistakes
Here is my recent OTB game, played with a time control of 60 minutes plus 10 seconds for each move made.
I was beaten psycologically imo, my opponent is currently in front of the South Australian state championships and that made me try to play defensively, which is always a bad idea. I should have instead "forgot" about my opponent's strength and reputation and just played my normal agressive game.
As a result, I missed opportunities for an advantage and found myself at a disadvantage and from that moment started to play some really stupid moves.
The game here shows how easy it is to play "absolute crap" when in the wrong mindset.