Really? Maybe you just forgot that you’ve forgotten previously. By your own admission your memory is terrible:
http://boards.straightdope.com/sdmb/showpost.php?p=18407038&postcount=10
http://boards.straightdope.com/sdmb/showpost.php?p=17397904&postcount=29
http://boards.straightdope.com/sdmb/showpost.php?p=19482703&postcount=10
http://boards.straightdope.com/sdmb/showpost.php?p=19383360&postcount=4
http://boards.straightdope.com/sdmb/showpost.php?p=19289509&postcount=120
Dunning-Kruger anyone?