Who sits there and types 4, 8, 15, 16, 23, 42 every hundred and eight minutes

Everyone is suspect.
Most suspect is he not seen doing anything suspicious.
Suspicion is cause for arrest.
Arrest is proof of guilt.
Thus, everyone guilty.

Was in my late teens while in the Army and picked up one of the collection of Spider Robinson's Callahan's Crosstime Saloon stories [maybe the first: it was '77]. As griffjon says, they were not really hard science fiction: stupid stuff, really [and I mean that in a good way; a fun way]. What was neat about them, and why they stand in my memory, was that they made me laugh at a time in my life where there wasn't a whole lot to laugh about, and inspired me to start writing, myself: similarly silly, science-fictiony short stories that I shared with some of the guys in my company.