When it was invented, the lance with a brick on the end was considered a marvel of contemporary medieval war technology. The lance with a brick on the end made it possible for unexperienced, n00b knights to defeat 1337 knights using the old-fashioned, brick-free lances nine times out of ten. The vast superiority of the lance with a brick on the end led to its near-universal adoption within a period of less than two decades. Note that the n00b knight on the right also has an Apexi "Cat back" muffler system on his head, which is first evidence that riceboys existed as early as the 14th century.
Many images in this compendium are very uncommon throughout the Internet hence the name. Many of these uncommon images have tongue-in-cheek pee-pants humour, thereby they were banned from the Internet for several decades until fans wanted to revive them. Wikipedians reserved images for encyclopedic uses only, however, oddball images from the UnCommons were allowed for Uncyclopedic websites.
A strict policy involves uploading the appropriate images. The image has to be good enough for viewers to accept. Generic images that humor an audience can be added to the compendium to accomodate Uncyclomediacs.