modeled after CFG generators, but much more simple to understand

genCDF.py

import random
def main():
    a = "A,The"
    b = "dog,cat,little kid,elephant,mouse,ugly neighbor kid,princess,clown,chimp,priest"
    c = "ran,cried,ate,made noise,jumped,slept,stepped on a spider"
    d = "and said `hello` to the gerbil,and then ate the fish,with the turtle"
    e = "without stopping,and called for his mother,along side his friend "
    f = "didn't get to go to the zoo for crying., had to go home to eat.\
    ,loved to eat pizza for breakfast.,just like a little piggy - cried all the way home"

    NP =random.choice(a.split(","))
    VP =random.choice(b.split(","))
    VP1 =random.choice(c.split(","))
    VP1a =random.choice(c.split(","))
    VP2 =random.choice(d.split(","))
    VP3 =random.choice(e.split(","))
    if VP == "little kid" and VP1a == "slept":
        VP1a = random.choice(f.split(","))   
    

    S = random.choice([[NP,VP,VP1a],[NP,VP,VP1,VP3],[NP,VP,VP1,VP2]])
    print " ".join(S)
    
for x in range(20):    
    main()   

Just run the file no more needed:
example output from above:
The little kid didn't get to go to the zoo for crying.
A little kid ran
The chimp made noise and then ate the fish
The dog made noise and called for his mother
A little kid stepped on a spider and called for his mother
The ugly neighbor kid stepped on a spider along side his friend
The mouse ate
A elephant ate without stopping
The ugly neighbor kid cried without stopping
A chimp cried
A princess cried
The princess stepped on a spider
The cat stepped on a spider and called for his mother
The elephant cried and called for his mother