Sometimes it happens that if you select (and move) multiple units, they will respond with a sound like a Star Wars laser cannon. Maybe that is the thing you encountered. It is harmless, though, and probably a vanilla issue.
In previous versions of EB, some Roman units also gave funny responses. For example, a unit in control of a ram would say "Aries! a-a", the last two vocals not belonging there, of course. This has been fixed in 1.2, though.
That's all I can think of off the top of my head.
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