On Sunday night, the finale of "Last Week Tonight," John Oliver shared his adoration for a little invention called the salmon cannon.
The cannon helps salmon overcome hydroelectric damns and other obstacles that would keep it from swimming upstream to spawn.
Oliver is thrilled by this invention. So excited, in fact, that he procures his own salmon cannon to test the limits of blasting fishy projectiles -- sharing his love for the cannon with Jon Stewart, Stephen Colbert and more. Watch below: