I still laugh at myself
My first line check to AKL many years ago. I was sitting there thinking if I had done everything correctly. The Check Capt was snoozing and the F/E was head down in his engine log. OMG after 6 hours and somewhere over Papua, I realised that I had left the landing lights on for the whole flight. Very slowly I reached up not to disturb the Capt and F/E and gently switched them off with a light cough to mask the noise. Within a nanosecond of a delay the F/E announced "Take off checklist complete" Check Capt woke up and just looked at me with one eye. I could have died there and then.......
As for that F/E, he kept reminding me for years, Top Man! Laughed every flight with him...