Here is a weird anniversary I came across on Wikipedia. On this day 164 years ago, the last known pair of Great Auks were killed. Not only is this a strange anniversary but the individuals who were responsible for the final extinction were Jón Brandsson, Sigurður Ísleifsson and Ketill Ketilsson.

The last population lived on Geirfuglasker (“Great Auk Rock”) off Iceland. This island was a volcanic rock surrounded by cliffs which made it inaccessible to humans, but in 1830 the rock submerged, and the birds moved to the nearby island Eldey which was accessible from a single side. The last pair, found incubating an egg, were killed there on 3 July 1844, with Jón Brandsson and Sigurður Ísleifsson strangling the adults and Ketill Ketilsson smashing the egg with his boot. (Wikipedia)