Scientists say...

http://www.zapatopi.net/

This is a great site for teaching your students the hazards of careless research, or just for a few laughs.  Assign a research report on the "Metric Time" movement, the "Pacific Northwest Tree Octopus," or the "Republic of Cascadia."  Give the page for this website as a starting point, but be sure to warn your students not to rely on a single source.