A bunch of people went to JSConf. But not me. Sure sounds like they had fun.
When I eventually went to JSConf US, years later, it was a lot of fun, but I spent the whole time coding, because I am a crazy person.
That mug is a reference to Fix Up Look Sharp by Dizzee Rascal - but before you start attributing street cred to me unfairly, I only know about it because of its presence in the soundtrack to DJ Hero where they mix it with Genesis by Justice, which is legitimately excellent.