Multiple opponents
Honestly, besides practicing multiple attacker sparring in class, the next best thing is to go to a punk show and get in the pit. People running around you teaches you to become more aware of what's around you. You might get kicked, elbowed, punched, headbutted, rammed with forearms, maybe tackled, fall over people, it's pretty darn good at teaching you how to react to a bunch of people around you. Of course, there are fights occasionally, but they usually aren't too bad..most of the time people (like me) will jump in and break them up before it turns into a big huge fight.
"I'm here to wipe the floor with your ass, and you know it, and everybody here knows it, and you deserve it."-Duncan, "Some Kind of Wonderful"
"I used to be with it, then they changed what it was. Now what I'm with isn't it, and what's it seems wierd and scary to me. It'll happen to you!!!" -Grandpa Simpson
"Once while walking through the mall a guy came up to me and
said 'Hey, hows it going?'. So I grabbed his arm and twisted
it up behind his head and said 'Now whose asking the questions?'" - Jack Handey
"There's no doubt in my mind that we should allow the world worst leaders to hold America hostage, to threaten our peace, to threaten our friends and allies with the world's worst weapons."George Bush—South Bend, Ind., Sept. 5, 2002