Given that 'Gangnam Style' is one of the most popular songs of 2012, it's not surprising that Psy was tapped to close last night's American Music Awards. But it WAS totally surprising when MC Hammer joined him onstage for an awesome mashup featuring 'Too Legit to Quit.'

At first, we didn't make much of Psy's harem pants, but when the '90s pop star joined him onstage, everything made perfect sense. Then, the oddball duo launched into a frenetic performance that brought the entire audience to its feet.

Despite the fact that we haven't seen much of Hammer lately, his novelty dance moves are fully intact, and Psy did his best to keep up. For one glorious moment at least, it was "Hammer Time" all over again.

What did you think? Did Psy officially jump the shark with this performance, or was this a great moment of two novelty dance titans teaming up?