Dying in Parliament is illegal (mythical but cited) — royal palace rule

Handling salmon suspiciously is illegal — anti-poaching

Gambling in libraries is illegal — public decency

Flying a kite dangerously is illegal — aviation safety

Using foul language in public is illegal — public order

Sleeping drunk in public is illegal — safety

Selling alcohol to a drunk person is illegal — health law

Owning offensive weapons is illegal — public safety

Trespassing on railways is illegal — safety

Feeding pigeons in some cities is illegal — pest control

Loitering with intent is illegal — crime prevention

Carrying planks on sidewalks is illegal — obstruction

It is illegal to be drunk while in charge of a cow
→ Farming + alcohol = disaster.

You may not enter Parliament wearing armor
→ A real medieval law that never expired.

It’s illegal to beat a carpet in the street after 8 a.m.
→ Victorian dust warfare.