1) Find two Zip files.
2) Quickly right click on each and do "Extract all..." (uncheck the box that says "Show me the uncompressed files).
I just did it twice in a row on two different zip files. Once this just gave me the "Explorer has stopped working" dialog. The second time, it crashed spectacularly with a "C++: pure virtual function call" dialog and had to be restarted by hand from Task Manager.
Edit: Also, why is it, when I actually get built-in unzip working, it only unzips at something like 16 bytes per second? Has anyone at Microsoft actually verified the usefulness of their built-in zip utility, or are they in cahoots with Winzip/afraid of legal action? What they've got in there now is worse than useless.