So this is how they learn English....
(http://www.nerd-age.com/wp-content/uploads/2012/09/Ribbon-chan-group-600x300.png)
Also, Moetan attempts to teach English too.
http://www.youtube.com/watch?v=2IS2O7MUJtQ (http://www.youtube.com/watch?v=2IS2O7MUJtQ)
Several years back a very disgruntled employee intentionally mistranslated a English phrases for Japanese tourists guidebook so it used all sorts of insults & profanity, and it actually made it to retail shelves without being corrected. This lead to a number of Japanese tourists, who bought the book, being assaulted abroad.
So when it comes to Japan making bad jokes like this, I cannot help but snicker at them. Thou it is nice to know where that one originated from. I've only seen that one in manga form. Also I find unintentional naughty moments far more amusing, like this Korean teacher practically begging for cock... ;)
http://www.youtube.com/v/9f9q4u4cdbs
^ Sounds familiar...
http://www.youtube.com/v/G6D1YI-41ao