The Hitch-Hiker's Aid is an attraction at the Museum of Modern Marvels.
If a car drives by, the brief case opens to release a robot that flashes the word stop from the area where it's mouth is.
If the Hitch-Hiker's Aid is tricked into coming out, it pokes out the eyes of the person who tricked it before going back into its briefcase.
The Hitch-Hiker's Aid has a glass bulb mouth that makes it look like it's smiling. If annoyed however, the glass bulb seems to reflect that fact.
Modern Inventions -1937