Are you asking the difference between 'tap X' and 'tap on X' or the difference between 'tap my head' and 'tap my shoulder'?
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Nona The BritAre you asking the difference between 'tap X' and 'tap on X' or the difference between 'tap my head' and 'tap my shoulder'the difference between 'tap X' and 'tap on X'
Marius Hancu You should tell us more about the context.About the context? In the movie two people were singing a song "If you are happy and you know it" http://en.wikipedia.org/wiki/If_You're_Happy_and_You_Know_It