>> Is there already a service industry afloat of people Bound At Low Leg On Ordinary Nature (short: BALLOON) trying to fish those before they escape into outer space?
I believe that if you tie the pen to a helium Balloon, it rises rather than falling, eventually creating festoons of deflated downed pens in Dragan's back yard. IMHO we don't need NET/Rube Goldberg solutions for a simple issue: just hold onto your pen.
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1
