Try seeing how good you are at reading out some of these tongue twisters. Better still, record your efforts and send them in to us. We'll post them up on this web site so you can show off to all your friends how good you are!
Here's one recorded by Lixue...
八百标兵奔北坡，( ba bai biao bing ben bei po )
炮兵并排北边跑。(pao bing bing pai bei bian pao )
炮兵怕把标兵碰，(pao bing pa ba biao bing peng)
标兵怕碰炮兵炮。(biao bing pa peng pao bing pao)