You can be a boor all day long if you want. The people in general can "act the idiot" and if they are being "smartalecks" or "funny" then they are tolerated in a way that they wouldn't normally be. It's a good moment to throw that "cream pie" in someone's face or pull some similar tasteless joke on someone, should you be so inclined, and you know you can get away with it.
You can also parade
round in any old scruffy gear, dirty yourself to your
heart's content - nobody will take any notice during
these days. It's part of the "charm" of
the Fiesta.
At the same time, when there are big gatherings such
as at the "Chupinazo" or the "Riau-Riau",
you have to accept without protest that anyone spraying
champagne round or people from the balconies pouring
water on the people, can dirty your clothes. Also
at the bullring, among the "Peñas"
there is a good chance that you could get your clothes
stained and you just have to take it with a pinch
of salt. In the bars too, you have to accept that
with all the dancing and pushing and shoving going
on, that your clothes can come out the worse for wear.
However, something very different would be if you
had the sudden bright idea of pouring a pint of beer
over some stranger's head just because you fancy the
idea. Here, you have stepped out of line and the recipient
of your tastleness joke has every right in the world
to take justice into his hands.
Inevitably there is a lot of pushing and shoving going
on. The bars are packed, the streets are packed, the
city is packed. However, if you are going to act like
a bull in a china shop everywhere you go without taking
even the minimum care of who or what you are stepping
on, then you can expect to get a deserved reprimant
from time to time.
In general, San Fermin is a rowdy Fiesta, and so it
accepts with good grace that the people will act the
idiot, do a lot of shouting, singing and screaming,
sleep rough, roll in the dirt, etc. as long as it's
all in good clean fun. You'll only really offend when
you do something in a mean smallminded way.
As long as it's fun, practically anything goes.