A Towel is the most important item a Hitchhiker can carry.
It's just about the most massively useful thing any interstellar Hitchhiker can carry. Partly it has great practical value. You can wrap it around you for warmth as you bound across the cold…
The Kill-o-Zap is a weapon wielded by the police from Blagulon Kappa. It is a standard and widespread brand of raygun. It is a gun for going out and making people miserable with.
The Babel fish is small, yellow, leech-like, and probably the oddest thing in the Universe. It feeds on brainwave energy received not from its own carrier, but from those around it. It absorbs all unconscious mental frequencies from this brainwave…