One student was stuck and wrote: The proof of this is
left as an exercise for the reader.
The prof wrote: Did it, fell for a non sequitur and made a 
minor calculation error. You get a B+.

Sign in a Belgrade hotel elevator: 

    To move the cabin, push button for wishing floor. If the cabin
    should enter more persons, each one should press a number of
    wishing floor. Driving is then going alphabetically by national order. 

One of the criteria by which Miss Nude USA was
chosen in 1979 was 'taste in clothing'