There's a nonsense poem that I learned at high school that I can't remember. I know the last few lines, but not the entire poem. If anyone can help me with it, that would be great.
(stuff... ) ... cock-
-tails, gingerbeer, 50 cents a glass
If you don't like it, stick it up your as-
-k me no questions, I will tell no lies
I once saw a policeman pulling down his -
-flies are bad, fleas are too,
And that is the end of my silly, silly tune.
Any help with the begining of this poem would be much appreciated! 
Mary had a little lamb
She thought it was so silly
She threw it up into the air
And caught it by its
Willy was a sheepdog
Lying in the grass
When along came the farmer
And kicked it up the
Ask no questions
And you'll be told no lies
Have you ever seen a Policeman
Playing with his
Flies are a nuisance
Fleas are worse
And that is the end
Of my silly little verse!!
I remember a naughty couple of lines from the school playground circa mid sixties which went; 'I chased a bug around a tree, I'll have his blood he knows I will'. At the time I didn't realise that it was meant to be an esoteric snatch of rudery, it just seemed another bit of schoolboy arcana. Like those 'one potato, two potato' exclusion rituals, or those skipping rhymes the girls chanted. I wonder whether there are any more of these things.
Thanks for that. It's different from the one I learnt, and after being frustrated, I ended up calling the friend in New Zealand who taught it to me. Her version starts,
Country girls are sexy, you should see them dance
They lift up their legs and you can see their
Micky was a bullfrog, sitting on a rock
I once saw a policeman pulling on his
Cocktails, gingerbeer, 50 cents a glass
If you don't like it, stick it up your
Ask me no questions, I will tell no lies
I once saw a policeman pulling down his
Flies are bad, fleas are too,
and that is the end of my silly, silly tune.
As you can probably guess, the policemen in our town weren't highly appreciated. 
thanks for posting it, Jessika !