Well, look at them now.
Karmin, the YouTube sensation known for nailing Busta Rhymes  and Lil Wayne's  flows with alarming skill, joined none other than the Roots  onstage at a Tufts University show last weekend -- and of course, the duo captured the surreal experience for their Internet fans.
Video: Karmin performs "Look at Me Now" with the Roots"
"You're incredible; we're beyond flattered," Karmin's frontwoman, Amy, said to Black Thought upon meeting him. To which Black Thought pointed and answered, "You guys," then jammed out onstage like a serious fan while she rapped spitfire onstage.
Watch Karmin bring its cover of Chris Brown, Lil Wayne and Busta's "Look at Me Now,"  which now has a whopping 10 million-plus YouTube views, to the live stage with the help of Roots drummer ?uestlove. And if you're not up on this duo yet, check out the rest of their covers and original songs here .
- Viral Videos