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Sorry, this programme is not available to watch again . (why?)
Last broadcast on Sun, 6 Nov 2011, 11:00 on CBBC (see all broadcasts).
Synopsis
Barney discovers the science of laughing and explains exactly why having a giggle is so good for us. Plus, Barney the dog goes behind the scenes of Legally Blonde - the Musical, to meet a small dog with a very big wardrobe.
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