Okay had an idea... think this one might be too obvious and\or too silly.
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EXT. STREET. NIGHT.
A MAN (TERRY) AND A MAN DRESSED AS SOME KIND OF MAN\SNAIL HYBRID (GARY) ARE WALKING DOWN THE STREET. TERRY IS SCOWLING AT GARY.
GARY
What?
TERRY STILL SCOWLS
GARY
Look we had to run we wouldn't have had a chance.
TERRY
That's the problem with you, no backbone.
D