**Update...my sister has oh-so-lovingly pointed out that in my garden I have a skunk, not a turtle. In case anyone was wondering, I know that. The snail on his back, though, reminded me of the joke and since this particular skunk would be moving MUCH slower than any turtle (that is still breathing), I thought it funny... so... there you go. :)
So... this morning... I was heading out the door to work and I happened to spot this sight in my garden. As soon as I saw it, I heard my niece telling us a joke a few years back (probably 4 years ago now, if not more).
"What did the snail say as it rode on the back of the turtle?"
I thought it was giggle-worthy. :)