Wow, what a story!
When I hitchhiked to Norway this summer with a friend and crossed over with a ferry from Denmark, we were the only ones on the whole ferry to be pulled over by the immigration officers. They made us unpack our bags and led some dogs in, but when the dogs did not find anything they let us go. Probably we were lucky to look German, so we neither went to prison nor did they make us undress!
You ended your story with a real cliffhanger and looking at the photo, I guess that the immigration officers turned out to be aliens and inserted you an anal probe? At least that's what would have happened in south park! :D