best way to innocently muck up someone else's show

...
stand outside as the audience are going in
handing out packets of chips and popcorn
to everyone
...
so, inevitably, there is going to be some rustling
the whole time
if not lots
...
...
...
and then
if you're feeling sadistic
stand outside after
when the actor or actors are leaving
and watch the chastened look on their face as they've had a
bloody awful time
with their show
...
the good thing about this malevolence is that a successful show will have the worst time
as there'll be more people
...
hee hee hee
...
this would be a very mean trick