Over the last year or so, "Emo Nite" has become an incredibly popular event where (essentially) a bunch of people get together and sing along to records from the late 90's/early 2000's.
Everyone from Mark Hoppus (Blink 182) to Demi Lovato (see below) has stopped by to play along
It's super popular, It's super harmless and It's super fun for a lot of people
See Below