This is awesome.
Blink-182 and Alkaline Trio frontman Matt Skiba performed onstage with A Day To Remember, at a recent gig in Chicago.
He joined forces with Jeremy McKinnon and the gang to tear through Alkaline Trio classic 'Private Eye'.
Watch it all go down just below.
You can catch ADTR across the UK early next year, with Neck Deep and Moose Blood in support.
22 - CARDIFF Motorpoint Arena
23 - GLASGOW Hydro
25 - BIRMINGHAM Barclaycard Arena
27 - LONDON Wembley Arena
28 - LEEDS First Direct Arena
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