🚀 go-pugleaf

Okay, now I'm REALLY mad and I'm gonna do something
(nasty) about it.  I have, once again, been stuck on
a long train ride near a person who was blasting
their walkman to the extent that is was disturbing
other passengers.  As is often the case, complaints
had little/no effect.
    I'd like to build a walkman jamming device for
use on the train.  One for walkman radios would be
easy, but of little use.  Any ideas whether a
short-range tape-recorder jammer (i.e. noise
generator) is feasible?  Any suggestions for
such a circuit are welcome.
    (Please don't bother telling me about telling
a conductor, I know it's possible although it doesn't
work well.  I also know I could just wear my own
load walkman, but this solution is much more
satisfying).