Flying as Pilot Assistant on a large Twin Cessna. Flew to France for several days of waiting in a Hotel for the rich passenger to desire a return trip. First night in Hotel meant following the lead of the glorious commander and over-sampling the delights of the bar. Awoke early the next morn to the ringing of the phone. "Get dressed....they want to go home right NOW!". Landed at a southern UK airfield in a state of misery and realised I was waaaay too plastered to drive home.
25 years on 737,747,757,767 and I never broke the 24 hour 'rule' ever again. 3 engine failures, 1 very near airmiss and several "I have control" events.