At least gangnam style (though already rinsed) had some comedy value and was particularly big in Asia (especially as Psy is Asian and big (I think he weighs a few kilos more than I do, and I like my food and beer as well).
There are fair few cultural in-jokes but the main one is that Psy was quite blatantly trying to be a “older brother/uncle trying to look cool and let his hair down” whilst staying true to Asian family values (he is nearly my age and worked for his Dad’s electronics company) and the original track is in fact mocking trends towards “western decadance” (a British equivalent would be taking the piss out of TOWIE culture).
Harlem Shake is just people making a poor imitation of trying to act like an African American. That sort of behaviour has always been common in any townie nightclub venue round here (even though its an English coastal/port town)..
