[Kai Hendry] > sam$ bplay dreamhost-angry2.wav > bplay: input is not a PCM WAV file > sam$ file dreamhost-angry2.wav > dreamhost-angry2.wav: RIFF (little-endian) data, WAVE audio, IMA ADPCM, mono > 8000 Hz
Indeed ... there are a lot of formats of wav files, bplay doesn't handle a very big range of them. It only plays PCM-format data, it does not contain any other codecs like ADPCM. (Your ADPCM sample file is a pretty funny message, by the way.)
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