i know its late but
Too bad i didn't find out about it until later, i would have been glued to the TV all night.
For those that still dont get it Toonami was an anime block on cartoon network, eventually they started doing toonami midnight runs which eventually became Adult Swim before Toonami jumped the shark and was canned.
on April 1st Adult swim was essentially Toonami midnight run like the good 'ol days.
the very next day: