How about "cry babies"? Your favorite non-SF/F character sobbing, shedding a tear or bawling like a little girl. Has that been done yet?
The other thing I thought of, as suggested above, was try to get two St actors in a shot together in a non-ST production. Such as Shatner and Nimoy in that "Man From UNCLE" "Strigas" episode. Or the two Enterprise doctors (Kelly and Hoyt) from that Bonanza episode.
Go for crying. That would be a lot easier.