Nissan has been running an ad campaign in Japan based on the 1974 anime Heidi, girl of the alps. The ads are sort of
bizarre awesome and were put together by the same crew that did The world of golden eggs. The full episodes feature Heidi trying unsuccessfully to find the answer to her question '低燃費って何？' (What's teinenpi?).
(the last set of links are all Japanese, but are hopefully interesting enough without subtitles)