I failed my PPL very early on in the test i.e. reading the compass incorrectly and using this setting on the DG.
I accurately followed this inaccurate setting and it all pretty much went down the toilet from then on. VFR nav was a weak point of mine anyway.
However, even though I had been told that I had failed at this point, I still continued on with the airwork/diversion sections. This made the retest the next day a lot shorter and simpler.
I was inconsolable the night I had failed and could hardly manage to drink even one pint of lager.
As tacpot said it was all forgotten with the elation of passing the following day. Surprisingly I managed to drink more lager that night