Wasabamole

What has been your greatest food faux pas?  Mine happened about 12 years ago, and involved sushi.  I was accustomed to California rolls, and avocado.  The substance in the plastic container was pale green, and it was on the same tray as my regular sushi.  I took a bite appropriate for avocado, which means a huge mouthful.  I learned right then how great wasabi is for clearing the sinuses and that, although by itself pickled ginger tastes like soap (I speak from experience), it will save your life if you have mistaken wasabi for avocado.