Pros:  Big fun
Cons:  Big space, lots of people, athletic

Blackhawk is played on a field with two sides that are "safe."

One person starts as it, and everyone else starts on one side.

When "it" calls out "Blackhawk" then everyone can start trying
to safely cross the field to the other side.  Anyone that "it" tags
joins "it" in the center of the field and then tries to start catching
people on the next call of Blackhawk.

You can't try to cross more than once, and you have to wait until "Blackhawk"
is called to give some semblance of order to the game.  If you choose,
you don't have to cross, this adds for the amusment of people coming from
both sides, but there is no honor in never trying to cross the field  :)