We live in a dangerous world. Al Queda. Rogue asteroids. Electrostatic shock from walking across a carpeted floor in your tubesocks and grabbing a brass doorknob. Now you can add catching a can of tunafish upside your dome to that list. At least around the gentrifying streets of the LIC. So do what I do and never leave the house without a helmet securely fastened. Or, at the very least, a cup.