[fallous]

I don't mean a single word prompt, I mean you can only use the single word or phrase as dialog and have to perform a scene (also randomly provided) with other actors. Bob gets "roses," Jill gets "fire," and a third person has unrestricted dialog... now do a scene where Jill is a salesperson getting ready for pitch to a big client.

The word salad you're describing would be no more difficult than having a scene where actors have to speak gibberish (faux Klingon or something)... which coincidentally isn't unlike another improv exercise where one person has to convey a message given to them by the director to other actors but must talk gibberish or just use a single vowel sound.