['they', 'find', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter'] ['themselves', 'hum', 'tune', 'surprise', 'to']
['<PRP>', 'declare-29.4-1-1-2', 'EmptyParameter', 'EmptyParameter', 'EmptyParameter'] ['<PRP>', 'manner_speaking-37.3', "Synset('change.n.03')", "Synset('happening.n.01')", 'to']
They find themselves humming a tune together, to each other's pleasant surprise.
<PRP> find <PRP> humming a Synset('change.n.03') together, to each other's Synset('pleasant.a.01') Synset('happening.n.01').