Watch John Oliver Attack Homer Simpson, R2D2 With Salmon Cannon

'Last Week Tonight' host closes out his first season by launching fish at Stewart, Stephen Colbert, David Letterman and more

John Oliver spent his acclaimed first season on HBO's Last Week Tonight sounding off on hot-button issues like civil forfeitures, the terror of drone strikes and the NFL's wishy-wishy policies toward domestic abuse. And during Sunday night's season finale, the host focused on another headline-maker: the Salmon Cannon. 

Oliver opens the bit by giving a definition of "salmon": "cat food for people, tuna's understudy that you hope never has to go on and that stupid fish that doesn't know how rivers work." The host then cites a recent TV news report demonstrating the Salmon Cannon, a device that assists the fish in spawning by launching them upstream through a massive tube. "In your darkest moments of despair," Oliver says, "when you see a world torn apart by war, I want you to remember that video and think, 'We can do great things.'" And said video is incredible. 

Unsatisfied with simply watching the Salmon Cannon, Oliver unveils his own knock-off version in a supercut video, which features an array of high-profile celebrities taking a fish in the face. First up is Oliver's old Daily Show pal Jon Stewart, followed by Jimmy Fallon and a cheesy scene from The Young and the Restless; there are also appearances from Dwight Howard, Stephen Colbert, Seth Meyers, Rachael Ray, Anderson Cooper, Tom Hanks, David Letterman, Wayne Brady and J.J. Abrams (directing R2-D2 on the set of the new Star Wars). The bit even takes an animated twist, with Homer Simpson subjected to pile after pile of salmon.