OK, another old one...
There once was a girl from Toronto
Who was exceedingly hard to get onto
But once you got there
And parted her hair
You could diddly her as much as you want to
Dates back to the late 1800's as the last one did. There's one more that I knew, but cant remember it all, something about a girl from ontario, bigtoe growing hairier and hairier, ends up with having to aquire the assistance of a terrier.