Oh, this could be fun. It would be even better if we could record some of them (on http://vocaroo.com/ or another website) and then post them here. I would love to give it a try, but I can't read Chinese.

Tongue twisters. 

红凤凰，粉凤凰，红粉凤凰花凤凰。

It will drive non-native speakers crazy. ;)