Good Afternoon All:
My favourite was this, back in the pre 9-11 days cockpit door was open as were going to KSFO x CYVR.
Father and son show up un-announced at the door and father in a "stage whisper" says to his son "see all they do is push buttons all day". Without missing a beat I turn around and said you are absolutely right sir as it is analogous to brain surgery you just have to know when and where to cut.
My poor F/O at the time was drinking some coffee and practically choked……………
Needless to say father turned beet red stammered and walked away.
To this day I still do not understand why I did it