The Weasel and the File
One day a little weasel went into a smith's shop. In the workshop there were colourful and strange tools. The weasel looked around for something to eat. On the table it saw a hard iron file. The weasel decided to eat this hard tool.
It came closer slowly and licked the file. The rough teeth of the file scratched its tongue. Its tongue became red and swollen, but the weasel did not notice. It thought the file was tasty and kept licking. With every lick the weasel hurt its own tongue.
At last its tongue hurt very much and it stopped. Nothing at all happened to the hard iron file. The poor weasel understood its big mistake. Attack the strong and you only hurt yourself. Spit against the wind and it comes back to your own face.