Panels from Batman '66 Meets the Green Hornet #11 (digital comic, October 2014), script by Kevin Smith and Ralph Garman, pencils and inks by Ty Templeton, colors by Tony Aviña, letters by Wes Abbott
Yes, the Batzooka! It looks like this in the live-action Batman '66 universe:
And it looks like this in the regular DC Universe.
Panel from Batman Confidential #14 (April 2008), script by Tony Bedard, pencils by Rags Morales, inks by Mark Farmer, colors by I.L.L., letters by Travis Lanham
Advantage: Batman '66.