I'd almost forgotten this one:
Student pilot on qualifying Xcountry calls and is unreadable.
ATCO says "unreadable, use the speechless code - once for yes, twice for no. The question is...are you visual with the field?"
Student pilot replies (in anguished voice) having got closer to the field and thus more readable... "once for yes!"
Luckily I remembered 'Aviate, howl with laughter, Navigate, Communicate' or I might never have got down in one piece.
Tori