stray cat problem

I'm betting he saw SOMETHING that shook him to his core, or annoyed him to no end.  Either could get that reaction.  And the shaking could be from the cold, or fear, OR anger.  I have a stray that I've been feeding, and have put out a little shelter for him for very cold weather.  Oh, and this is worth reading (and funny as all get out, as well!):

Stray Cat Rules

STRICT, UNBENDING RULES FOR DEALING WITH STRAY CATS
 
   1. Stray cats will not be fed. 
   2. Stray cats will not be fed anything except dry cat food. 
   3. Stray cats will not be fed anything except dry cat food moistened with a little milk. 
   4. Stray cats will not be fed anything except dry cat food moistened with warm milk, yummy treats and leftover fish scraps. 
   5. Stray cats will not be encouraged to make this house their permanent residence. 
   6. Stray cats will not be petted, played with or picked up and cuddled unnecessarily. 
   7. Stray cats that are petted, played with, picked up and cuddled will absolutely not be given a name. 
   8. Stray cats with or without a name will not be allowed inside the house at any time. 
   9. Stray cats will not be allowed inside the house except at certain times. 
10. Stray cats will not be allowed inside the house except on days ending in "y". 
11. Stray cats allowed inside will not be permitted to jump up on or sharpen their claws on the furniture. 
12. Stray cats will not be permitted to jump up on, or sharpen claws on the really good furniture. 
13. Stray cats will be permitted on all furniture but must sharpen claws on new $114.99 sisal-rope cat-scratching post with three perches. 
14. Stray cats will answer the call of nature outdoors in the sand. 
15. Stray cats will answer the call of nature in the three-piece, high- impact plastic tray filled with Fresh'n'Sweet kitty litter. 
16. Stray cats will answer the call of nature in the hooded litter pan with a three-panel privacy screen and plenty of head room. 
17. Stray cats will sleep outside. 
18. Stray cats will sleep in the garage. 
19. Stray cats will sleep in the house. 
20. Stray cats will sleep in a cardboard box lined with an old blanket. 
21. Stray cats will sleep in the special Kitty-Komfort-Bed with non- allergenic lamb's wool pillow. 
22. Stray cats will not be allowed to sleep in our bed. 
23. Stray cats will not be allowed to sleep in our bed, except at the foot. 
24. Stray cats will not be allowed to sleep in our bed under the covers. 
25. Stray cats will not be allowed to sleep in our bed under the covers except at the foot. 
26. Stray cats will not play on the desk. 
27. Stray cats will not play on the desk near the computer. 
28. Stray cats are forbidden to walk on the computer keyboard on the desk when the human is asdfjjhhkl;ljfd.;oier'puyykmm4hbdm9l o9jmdskdm,.USING IT.

OH...and welcome to TCS!  Be sure to stop over at "New Cats on the Block" and introduce yourself and your kitties...including your stray!

I think there was some other animal there or just there that you may not have seen. I think it'll probably be all good next time. If tried to pet the stray when he sees my inside cars and is upset and it appears to be the same experience you had.