For those of you poor souls who get caught up in the Brazilian wave while vacationing in WDW, I have a solution. Now it may take a little work, but I think this is what you should do:
1. Locate the Brazilian Tour Guide. He's easy to spot, usually carrying a megaphone, large flag, and wears a silly yellow shirt. If you still can't locate him, he's usually the one running to the next ride several thousand of his countrymen behind him.
2. Once the tour guide is located, then find an ideal time to casually sneak up behind him so no one sees you and drag him into the Hall of Presidents. The Brazilians will never look for him in there, and besides it's usually pretty empty anyway.
3. Tie him up and take his megaphone, shirt and flag.
4. Now, dress up a dummy in his megaphone, shirt and flag.
5. With the dressed up dummy (in Brazilian tour guide gear), run past his (now confused) tour group.
6. They will all recognize the flag and start a full on sprint in pursuit (to what they think will be the next ride). If you are a world class sprinter, this makes for fun.
7. Now, make your way out of the park and head straight for the tram car line.
8. Push your way to the front of the tram car and place the dummy in front. The entire tour group will push their way, stomping and chanting to get on board the tram car. The tram cars are pretty big and should carry the entire group.
9. Now jump off and leave the dummy on the tram car. They will not go anywhere without the tour guide, so you can bet the entire tour group will sit on the tram car for several hours chanting and stomping around the beautiful and very hot parking facilities.
10. Re-enter the park, to enjoy the rest of your day. Problem solved, and no one got hurt. As for the Brazilian tour guide, who knows, he might learn a little bit of americana listening to the Hall Of Presidents a few hundred times.
And remember, "it's a small world after all".