Jesse Pinkman has been banned, after several warning for obsessive posting on a single topic, ignoring mod instructions, personal insults, and general jerkitude, all of which added up to a pattern of trolling.
http://boards.straightdope.com/sdmb/showpost.php?p=16984137&postcount=19
http://boards.straightdope.com/sdmb/showpost.php?p=16961652&postcount=62
http://boards.straightdope.com/sdmb/showpost.php?p=16960861&postcount=93
http://boards.straightdope.com/sdmb/showpost.php?p=16922754&postcount=101
http://boards.straightdope.com/sdmb/showpost.php?p=16892156&postcount=204