Identify this cartoon movie

All of the details here are fuzzy, so I will describe them as they are…

When I was about 4 or 5 years old, my parents sent me and my sister to a matinee film show at a cinema in RAF Akrotiri (my dad was stationed there in the early 1970s).

I don’t remember much about the films we watched, except for one of them, in which the protagonist character (which may have been Bugs Bunny, but I am not certain) was repeatedly being intercepted by the antagonist character (which may have been Marvin the Martian, but I am even less certain).
The action, I think, chiefly comprised the antagonist’s pitfalls backfiring on him, upon which he spoke the phrase “You may go, now”, allowing the protagonist to continue unmolested; this phrase was repeated throughout the show, as each of the successive attacks backfired. This phrase is the most-cemented memory of the thing (and therefore the detail that I think is most certain)

That’s as much as I really remember and at that point in my life I had uncorrected vision so whatever was actually happening onscreen will have been fuzzy in my perception at the time, not just in my memory some 50 years later (now). I remember at the time thinking that the antagonist character was an animated/anthropomorphised bomb of the classical black-sphere-with-a-hissing-fuse type, which is what makes me now think the character may actually have been Marvin the Martian, whose head appears to be just a black sphere with eyes.

Given that this showing took place in a cinema on an RAF base, I can’t rule out the possibility of this being some sort of information film about trust or security or reporting suspicious activity or something, rather than just a pure entertainment movie.

Can anyone identify the exact cartoon I am describing?

Oh, the described scenes may have been taking place at some sort of checkpoint or sentry box (the protagonist being told to halt by the antagonist, then something happens, then the antagonist says ‘you may go now’).

The Pink Panther “Inspector” cartoons had this guy.

I don’t think that’s it.

Oh, it might actually be that. It does spark some pieces of memory

Some sort of conflated memories, then?

Yeah, I’m starting to think the ‘you may go now’ phrase happened in some Tex Avery cartoon and the little bomb guy was from the Inspector cartoons - maybe I saw both in the same showing and they got jumbled up in my 4YO brain (I think this mixup happened at the time, rather than since, because I remember joking with my sister to the effect “boom!.. you may go now”)