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John Oliver's 'salmon cannon' flings fake fish across 'Tonight,' 'Simpsons'

The “Last Week Tonight” host exhibited his own version of a salmon cannon on his show, shooting fake fish out of the device and onto the sets of other NBC shows. The device actually does exist and helps salmon migrate upstream to spawning grounds.

The “Last Week Tonight” host exhibited his own version of a salmon cannon on his show, shooting fake fish out of the device and onto the sets of other NBC shows. The device actually does exist and helps salmon migrate upstream to spawning grounds.