hahaha Vibraphones are pretty common, I cant remember if there was one in the middle school band, but every HS band has one, to the best of my knowledge, if not two.  However with all the names of percussion instruments people generally thing of xylophones and marimbas.  People generally forget the glockenspiel, another name for the bell kit, the chimes or the vibraphones.  Yes, if other percussionists see this post I know I left quite a few mallet instruments out.