"The Hangover 2" (2011) Trailer

I can't understand why people liked so much the first "Hangover" by director Todd Phillips? Usual story about guys, who got drunk in Vegas and woke up with some consequences (babies, tigers etc). But this movie got $467,483,912 (with budget - $35 000 000). So I'm sure the 2nd part would be as successful.

Hangover 1 trailer (to refresh ur memory):



Hangover 2 trailer: