Skrillex is big on going B2B; from his numerous gigs this year with Diplo as Jack U (including their massive NYE blowout at Madison Square Garden tonight) to his Dog Blood collaboration with Boys Noize to a random B2B with Mija during Bonnaroo. The bigger the surprise, the better (obviously), which makes his unscheduled appearance at Kaskade's Redux show at Pier 36 in NYC last night that much more exciting. It looks like some people on the 'Net are pissed because Skrillex dropped some trap during Kaskade's set—as you'll see below, they're both bopping to "CoCo"—but when you're going B2B, isn't that what's supposed to happen? Check out the clips down below.