The planet in question is in fact the legendary Magrathea.
The deadly missile attack shortly to be launched by an ancient automatic defense system will result merely in the breakage of three coffee cups and a mice cage, the bruising of somebody's upper arm, and the untimely creation and sudden demise of a bowl of petunias and an innocent sperm whale.
In order that some sense of mystery should still be preserved, no revelation will yet be made concerning whose upper arm sustained the bruise. This fact may safely be made the subject of suspense since it is of no significance whatsoever."
-- Douglas Adams, The Hitchhiker's Guide to the Galaxy
That's all I have to add. His foot has to rest for a few days.