"AAAAAAHHHHH!!!" you both scream in unison. You try to
stand up again and this time you succeed. You look around trying to
find a weapon or something floating the stream.
After a few minutes you start to feel a weird tickling sensation on
your toes. You think nothing about and just float along, thoroughly
bored. The tickling sensatino get stronger, and stronger, then it's
starts to hurt really bad. You look down at your feet and see
hundreds of tiny brown fish nibbling at your toes. "Poo
Piranhas!!!" you scream at the top of your voice. You've heard
about these things. They live in the sewers eating all the poo. But
occasionally when somebody's stupid enough to fall down the manhole
they slowly devour them, starting with the toes.