Yes, the elusive yet terrifying Bear bumper from PBS KIDS' glory days was not only captured in HD (albeit stretched to fit the 16:9 TV format), but STILL AIRING on an actual PBS station: WFYI in Indianapolis. Relive your nightmares in HD! Also, did this bumper air on your station (or still does?!) KLRN stopped airing it around 2005.
Credit to AhMath Tate for the video!