Fred fed Ted bread, and Ted fed Fred bread

Tongue twisters are always funny. It makes ur tongue go mad b4 u complete the phrase. It is definitely tough to articulate it clearly. In fact, it is designed to be difficult. I came across a tt which seems like it is the toughest one in english to be repeated continuosly. 

"The sixth sick sheik's sixth sheep's sick."

A longer tt

"Mr. See owned a saw.

And Mr. Soar owned a seesaw.

Now See's saw sawed Soar's seesaw

Before Soar saw See,

Which made Soar sore.

Had Soar seen See's saw

Before See sawed Soar's seesaw,

See's saw would not have sawed

Soar's seesaw.

So See's saw sawed Soar's seesaw.

But it was sad to see Soar so sore

Just because See's saw sawed

Soar's seesaw!"  

This reminds me of my childhood days where twas fun pulling others legs tongues :P