One day when walking down a crowded city street with his friend John, he said with great excitement, 

"L-l-l-l-look at that g-g-g-girl.  W-w-w-what a f-f-f-f-f-f-figure!"

"Where? Where?" demanded John, equally excited, once Pete had managed to get his message across.

"Too late," said Pete very calmly.  "She walked into a building."
 
A moment later, he said, "L-l-l-l-look at that c-c-c-c-car.  N-n-n-n-never saw s-s-s-s-s----"
 

"Where? Where?" demanded John again.
 
"Turned the corner," said Pete clearly.
 
A few minutes passed and Pete began again, "L-l-l-l-l-look---"
 
Weary of having everything over before Pete could finish, John quickly said, "It's all right.  Yeah, I see, I see..." 

There was a brief pause and then Pete said, 

"If you s-s--s-s-saw it, why did you s-s-s-s-step in it?"