You should duck when you come up to those things.
(Mine is from a novel by Keith Laumer -- explained on my profile page.)
I just re-read “Combat Unit” this morning :-)
I don’t know what it is about Laumer’s Bolos and Retief stories that I enjoy so much. But when I desire a little break from reality, reading Laumer never fails to satisfy.
Command: “Death by Chains.”
Response: “So judged.”