Just when we thought we'd seen it all.
Well, sort of, anyway. The invention is actually a long tube that was designed in Washington state to help fish migrate across dams.
Regardless, it's a fascinating specatcle to watch -- so fascinating that Oliver went ahead and built his own salmon cannon in his studio.
In this case, though, the salmon never made it across Washington; rather, they wound up in the oddest of places -- like, you know, our kitchen studio.
Watch what happens when the salmon comes face-to-face (or, rather, head-to-head) with Rach in the hilarious clip, below.