And never ever say that the instrument you are carrying in its case is an axe or a bazouki. Call it "a kind of guitar".

At some time in the future worrying about poison gas and germs might make sense. But right now it's more commonplace things that are the dangers.

Vehicles filled with fuel. Agricultural fertiliser. Buildings and roads which have been built on stilts where a car can be parked next to them. Tunnels and bridges. Railway lines. Ferries. Pipelines. Tankers.