SOAPBOX

[noun] [C] - a rough wooden box used, esp. in the past, for storing and carrying goods in and traditionally used as a raised surface for people to stand on while making informal public speechesWe used to go to Speaker's Corner in Hyde Park and watch people making speeches on their soapboxes.(figurative disapproving) If we're not careful he'll get on his soapbox (= start to express his opinions with force) again and start lecturing us on the evils of the modern world!