Do you know any?

四是四，十是十，十四是十四，四十是四十。

Not really a tongue twister, but:

「《施氏食獅史》
石室詩士施氏，嗜獅，誓食十獅。
氏時時適市視獅。
十時，適十獅適市。
是時，適施氏適市。
氏視是十獅，恃矢勢，使是十獅逝世。
氏拾是十獅屍，適石室。
石室濕，氏使侍拭石室。
石室拭，氏始試食是十獅。
食時，始識是十獅，實十石獅屍。
試釋是事。」

I would be forever grateful if you guys could provide pinyin

I'm a fan of mandarin but I haven't had time to really indulge in it yet.

ocircle Wrote:I would be forever grateful if you guys could provide pinyin

I'm a fan of mandarin but I haven't had time to really indulge in it yet.

The first one is

sì shì sì, shí shì shí, shísì shì shísì, sìshí shì sìshí.

The second one is better when you hear it, but here's the pinyin.

Shíshì shīshì Shī Shì, shì shī, shì shí shí shī.
Shì shíshí shì shì shì shī.
Shí shí, shì shí shī shì shì.
Shì shí, shì Shī Shì shì shì.
Shì shì shì shí shī, shì shǐ shì, shǐ shì shí shī shìshì.
Shì shí shì shí shī shī, shì shíshì.
Shíshì shī, Shì shǐ shì shì shíshì.
Shíshì shì, Shì shǐ shì shí shì shí shī.
Shí shí, shǐ shí shì shí shī, shí shí shí shī shī.
Shì shì shì shì.

This is pretty funny too.

And here's a translation:

In a stone den was a poet Shi Shi, who loved to eat lions, and decided to eat ten.
He often went to the market to look for lions.
One day at ten o'clock, ten lions just arrived at the market.
At that time, Shi Shi just arrived at the market too.
Seeing those ten lions, he killed them with arrows.
He brought the corpses of the ten lions to the stone den.
The stone den was damp. He asked his servants to wipe it.
After the stone den was wiped, he tried to eat those ten lions.
When he ate, he realized that those ten lions were in fact ten stone lion corpses.
Try to explain this.

It is not written in modern Standard Chinese, but in Classical Chinese, which was not intended as a spoken language.

check this site: http://www.uebersetzung.at/twister/zh.htm
It includes pinyin and translation.