Interviewed for a dream job (British Antarctic Survey) in 1982. Failed a 20 line "write pythagoras in Fortran or Pascal" test in front of the selection committee.

I was deeply unsettled by this. Made me realize that sometimes what the interviewer is doing, is making you wake up to your own lack of awareness. I must have been a complete prick in the interview. I shudder to think about it to this day.