I hadn’t heard of a Millwall brick before:
A Millwall brick is an improvised weapon made of a manipulated newspaper.The Millwall brick was allegedly used as a stealth weapon at football matches in England during the 1960s and 1970s. The weapon’s popularity appears to have been due to the wide availability of innocently appearing newspapers, and due to the ease of its construction.
Seemingly mindless criminals can be remarkably clever when it comes to making weapons.